This ancient prayer from the first millennium is found in the 1970 Missal as the collect for Holy Wednesday, the Feast of the Triumph of the Cross (Sept 14), and votive Masses of the Holy Cross. In the the 1962 Roman Missal it is used as the collect for Holy Wednesday and for votive Masses of the Holy Cross during Pascal time.
DEUS, qui pro nobis Filium tuum Crucis patibulum subire voluisti, ut inimici a nobis expelleres potestatem: concede nobis famulis tuis; ut resurrectionis gratiam consequamur. Per eundem Christum Dominum nostrum. Amen.
O GOD, who for our sake didst will Thy Son to undergo the torments of the Cross, that Thou mightest drive far from us the power of the enemy; grant unto us Thy servants that we may attain to the grace of His Resurrection. Through the same Christ our Lord. Amen.
From the Raccolta #211, from the '62 Roman Missal. (S. P. Ap., Nov. 22, 1934).