The plaintiff relies, to maintain his action, upon a breach by the defendant of the covenant of general warranty in the deed of the West Roxbury estate of the date of August 19, 1872, — this estate being at the time of its execution subject to a mortgage originally made to Michael E. Bowe, for the sum o4 $3000, and by intermediate assignments transferred to Betsy J. Pope, — and further upon an eviction by Mrs. Pope, who on De *505cember 29, 1872, made an entry upon the premises in order to foreclose the said mortgage.
The certificate of entry produced at the trial is made by the statute evidence of the fact of such entry. Gen. Sts. c. 140, § 2. Oakham v. Rutland, 4 Cush. 172. Thompson v. Kenyon, 100 Mass. 108. There was no other evidence of eviction or of any actual ouster of the plaintiff from the occupancy of the premises, and the defendant contends that this entry was not an eviction which will enable the plaintiff to recover upon his covenant of warranty. But that it is so is settled by the law of this Commonwealth. Tufts v. Adams, 8 Pick. 547.
In White v. Whitney, 3 Met. 81, 89, the facts, as stated in the opinion of the chief justice, are not distinguishable from those in the present case. The entry to foreclose was made under the provisions of the Rev. Sts. c. 107, §§ 1, 2, which do not vary from those of Gen, Sts. c. 140, and it was held that the 16 taking actual possession of the premises, by means of which the plaintiff was ousted,” was a breach of the warranty. That case did not show, any more than the one before us, any actual ouster from occupancy of the holder of the equity of redemption, but from the time of such entry the legal possession was that of the mortgagee, whoever the occupant might be. Permitting the mortgagor to remain in occupancy during the three years, does not render the entry any less effectual for the purpose of foreclosure. Ellis v. Drake, 8 Allen, 161. Fletcher v. Cary, 103 Mass. 475. The argument that, if the covenantee upon such eviction may recover his full damages, he may keep them and not devote them to the payment of the mortgage debt, leaving the covenantor still personally liable thereon, is one of force; but it is equally true that if the covenantee cannot recover his full damages when a step is taken, which, if not arrested, must deprive him of his estate, he may lose it simply because by reason of the mortgage upon it he may be without the means of raising money upon his only security. The covenantor can avoid this difficulty by doing what he ought, namely, paying the debt at any time before judgment, thus reducing the damages to those merely nominal.
The rule of damages, as given by the court, was also correct. The general rule is that, where the grantee becomes seised, the sstate having passed by for?e of the conveyance, and is after-*506wards evicted by a paramount title, the value of the estate at the time of eviction is the measure of damages. Gore v. Brazier, 3 Mass. 523, 543. Norton v. Babcock, 2 Met. 510. It has been held, however, in favor of the covenantor, that when the mortgage is less than the value of the land, and it would be plainly for the interest of the holder of the equity of redemption to redeem, the covenantee on such eviction shall recover only the amount of the mortgage, with interest, and not the full value of the estate. Tufts v. Adams, ubi supra. White v. Whitney, ubi supra.
The plaintiff also claimed to recover of the defendant for breach of the agreement in the deed of the Hyde Park estate to the defendant, which was accepted by the defendant, and contained this clause: “ Subject to mortgages amounting to $6500, which the grantee hereby assumes and agrees to pay, and all interest now due on existing mortgages on said property, together with the taxes due on the same.”
For the debt secured by the mortgage the plaintiff was liable, and the question presented is whether the plaintiff is entitled to recover nominal damages only, as contended by the defendant, or whether he may recover the amount of a mortgage upon the estate of $1500, with interest, which neither party has paid. The precise question involved here was raised in Brewer v. Worthington, 10 Allen, 329, but it was not there necessary to decide it. If the agreement is to be treated as one merely to indemnify the plaintiff against any loss or damage by reason of this mortgage, it would be necessary to show that he had been in some measure damnified thereby. Little v. Little, 13 Pick. 426. But there is no reason why an agreement may not be made which shall bind the party so contracting to pay the debt which another owes, and thus relieve him or his estate from it, and, if 'die promise thus made is not kept, why the promisee should not recover a sum sufficient to enable him so to do. Such is the construction to be given to the agreement in the case before us. As a consideration for the property conveyed to him, the plaintiff conveyed the Hyde Park estate to the defendant, who contracted not to indemnify the plaintiff against, but to pay the mortgages upon it, and, if he has failed to do this, the plaintiff should be entitled to recover the amount which the defendant thus agreed *507to pay. It is a portion of the consideration money due the plaintiff, which he was to receive by payment of a debt for which he was liable, which he thus recovers, when the defendant fails to perform his promise. That the plaintiff should be kept subject to a debt from which the defendant agreed to relieve him is a continuing injury for which a sum of money which will enable him to discharge it is an appropriate remedy in damages.
That a promise to pay a debt due from the promisee, even where it has not been paid by him, is one upon which an action may be maintained and damages recovered to the amount of such debt, is held by many authorities. Holmes v. Rhodes, 1 B. & P. 638. Cutler v. Southern, 1 Saund. 116, Wms.’ note. Toussaint v. Martinnant, 2 T. R. 100. Martin v. Court, 2. T. R. 640. Hodgson v. Bell, 7 T. R. 97. Thomas v. Allen, 1 Hill, 145. Loosemore v. Radford, 9 M. & W. 657. Penny v. Foy, 8 B. & C. 11. In Lethbridge v. Mytton, 2 B. & Ad. 772, the defendant, by a settlement made upon his marriage, conveyed an estate upon certain trusts, and covenanted with the trustees to pay off incumbrances on the estate to the amount of £19,000, within a year, and it was held, upon his failure to do so, that the trustees were entitled to recover the whole £19,000 in an action of covenant, although no payment had been made by them, and nc special damage was laid or proved. Whether the contracts in some of these cases were anything more than contracts of indemnity, and therefore whether there could under our decisions have been any recovery, might perhaps be questioned. Cushing v. Gore, 15 Mass. 69. Little v. Little, ubi supra. That, however, need not now be considered, as we treat the agreement before us as one not for indemnity merely, but for payment. Nor is it important that the cases above cited are those in which the promisor agreed to pay on a particular day, or within a specified time. That cannot affect their application. An agreement to pay a debt, no time being specified, is an agreement to pay it when due, or forthwith, if it be already due. Here it appears that the promise was made on August 19, 1872, that the mortgage debt which the defendant was to assume and pay became due on September 1, 1872, and that the action was brought on March 10, 1873. That an action may be brought upon a promise to pay a debt due from the promisee, and, although he has not paid the same, full dam*508ages recovered, is recognized clearly by the case of Goodwin v. Gilbert, 9 Mass. 510. The question is not there discussed in the opinion of the court, which treats another inquiry as the only one important in the case, but, having disposed of that in favor of the plaintiffs, judgment was rendered for the full sum.
There is an embarrassment undoubtedly where the agreement is to pay a debt due from the promisor as well as the promisee. It is similar to that heretofore considered, where there is an eviction by one holding a mortgage title, and the covenantee is allowed to recover in damages the amount of the mortgage upon which the covenantor is personally liable. As the Hyde Park estate, now the property of the defendant, is charged with the payment of the mortgage debt, if the plaintiff should not devote the sum recovered by him to its payment, the defendant might hereafter, in order to relieve his property, be compelled to pay the amount a second time. There is no mode, at law, by which this difficulty can be avoided, and the plaintiff enabled to receive the benefit of his contract. Loosemore v. Radford, ubi supra. Perhaps in equity, where a proper case for its interference was shown, a remedy would be afforded, that would secure the party paying under such circumstances from having the payment made by him devoted to any other object than that which would relieve him or his estate from further responsibility. However this may be, the want of elasticity in the forms of the common law, which does not enable us to make such a decree here as would guard the rights of all parties, should not prevent us from giving to the plaintiff the benefit of the contract which he has made, or compel him to remain subject to the burden of the debt, which the defendant has agreed to extinguish. As was suggested upon the other part of the case, the defendant may, if he will, perform his agreement and pay the debt at any time before final judgment, and the damages then to be recovered will be nominal only.
The other exceptions argued by defendant may be briefly disposed of.
Whether the bargain, which there was evidence tending to show had been made for an exchange of certain real estate in Hyde Park and a house on Shawmut Avenue, both owned by the plaintiff, for an estate in West Roxbury, owned by the defendant, had ever been carried out and the deeds delivered was a mat*509fcer in dispute at the trial, and evidence that, after the date when the plaintiff claimed the deeds to have been delivered, the defendant had treated the estate on Shawmut Avenue as his own, legitimately tended to show that such bargain had been actually completed, although the suit brought by the plaintiff did not relate to an alleged breach of covenant as to that estate.
There was evidence that the signature of Lucretia D. Durgin, wife of the defendant, who released thereby her right of dower and of homestead in the West Roxbury estate, had been made before any description had been written in the deed, and that she never saw it and did not redeliver it afterwards. But even if this would render the deed invalid as to her, it would not relieve the defendant from the covenants in the deed which bound him only. Exceptions overruled.