15 Thus, like Jesus Christ, it so happened that St. Francis was born in a stable; a little child as he was, his couch was of straw on the ground. And it is also related that, at that moment, the presence of angelic choirs, and melodies wafted through the air, completed this resemblance. Again, like Christ and His Apostles, Francis united with himself some chosen disciples, whom he sent to traverse the earth as messengers of Christian peace and eternal salvation. Bereft of all, mocked, cast off by his own, he had again this great point in common with Jesus Christ,-he would not have a corner wherein he might lay his head. As a last mark of resemblance, he received on his Calvary, Mt. Alvernus (by a miracle till then unheard of the sacred stigmata), and was thus, so to speak, crucified.
Source: Auspicato Concessum (Vatican.va)