Psalm 44:6 (ESV)

6 For not in my bow do I trust, nor can my sword save me.

The bow and the sword are weapons. The soldiers of God’s people use these weapons. The only thing is that they cannot put their trust in these weapons; their trust is to be directed to God alone (see Psalm 44:5, through your name). God’s faithfulness, God’s strength—that is what we trust in and bring up in our prayers.