Ronan, J.
The plaintiff held a mortgage upon an automobile owned by one Blair. In an action by the present *119defendant Roberts and another against Blair, in which the plaintiff was summoned as trustee in accordance with the provisions of G. L. (Ter. Ed.) c. 223, § 79, the automobile was attached after written consent to make such attachment was given by the judge of the court in which the action had been commenced. G. L. (Ter. Ed.) c. 223, § 44A, inserted by St. 1937, c. 295, § 2. Service was made in that action upon Blair and upon the present plaintiff as trustee. The latter knew at the time of service upon it that the automobile had been attached. Both the principal defendant and the trustee in that action failed to appear, and judgments after defaults were entered against them. The automobile was sold to the present defendant Larounis, who purchased for Roberts at public auction upon a levy of the execution that issued upon the judgment. Blair and a representative of the plaintiff attended the public auction. The plaintiff then brought the present action of replevin against Larounis and Roberts. There was a finding for the defendants. The report was ordered dismissed by the Appellate Division.
The judge denied the first, third and fifth requests in so far as they were at variance with a finding and ruling made by him, to the effect that the plaintiff’s rights, as mortgagee in the mortgaged property, were concluded by its failure to appear and answer and by permitting a default to be entered against it in the action in which it, as mortgagee, had been summoned as trustee.
There was no error in the refusal to grant the first request because the plaintiff was not entitled to immediate possession of the automobile. The third request could not be given as it was not supported by the agreed statement upon which the case was tried. The denial of the fifth request, to the effect that the default of the plaintiff as trustee mortgagee and the entry of judgment did not deprive it of its rights under its mortgage, was right. It was said by Morton, C.J., in Goulding v. Hair, 133 Mass. 78, at page 81, that “If the mortgagee fails to appear and is defaulted, he is estopped to set up the validity of his mortgage, and cannot maintain an action against the attaching officer *120for a conversion of the mortgaged property by a levy of the execution thereon. Flanagan v. Cutler, 121 Mass. 96.” When an attachment of mortgaged personalty is made by attaching the property as unencumbered and summoning the mortgagee as trustee of the mortgagor, then all questions concerning the validity of the mortgage and the interest of the mortgagee are lo be determined in that action. Martin v. Bayley, 1 Allen, 381. McDonald v. Faulkner, 154 Mass. 34. Shapiro v. Park Trust Co. 253 Mass. 383. It was the duty of the present plaintiff as mortgagee to assert its rights in the property under its mortgage, and it is now precluded by the judgment following its default to assert such rights in the present action. In none of the cases upon which the plaintiff relies did the trustee mortgagee fail to appear or to be heard.
Order dismissing report affirmed.