Verses with the word valiantly in the Old Testament (6 verses):

Numbers 24:18
And Edom shall be a possession, Seir also shall be a possession for his enemies; and Israel shall do valiantly.

1 Chronicles 19:13
Be of good courage, and let us behave ourselves valiantly for our people, and for the cities of our God: and let the LORD do that which is good in his sight.

Psalms 60:12
Through God we shall do valiantly: for he it is that shall tread down our enemies.

Psalms 108:13
Through God we shall do valiantly: for he it is that shall tread down our enemies.

Psalms 118:15
The voice of rejoicing and salvation is in the tabernacles of the righteous: the right hand of the LORD doeth valiantly.

Psalms 118:16
The right hand of the LORD is exalted: the right hand of the LORD doeth valiantly.