am 3108, bc 896 (Title), This seems to be an επινικιον:, or triumphal song, in which the victory is wholly ascribed to Jehovah; and to none can it be referred with more propriety than to that of Jehoshaphat over the confederated forces of his enemies, 2 Chronicles 20:1-37.
unto us: Psalms 74:22, Psalms 79:9-10; Joshua 7:9; Isaiah 48:11; Ezekiel 20:14, Ezekiel 36:32; Daniel 9:19; Ephesians 1:6; Revelation 4:10-11
for thy mercy: Psalms 61:7, Psalms 89:1-2; Micah 7:20; John 1:17; Romans 15:8-9