John Gill Commentary Psalms 55:18

"He hath redeemed my soul in peace from the battle that was against me; For they were many [that strove] with me." — Psalms 55:18 (ASV)

He has delivered my soul in peace from the battle [that was]
against me

That is, God had preserved his life, and delivered him safe and sound from many a battle which was fought against him, and might seem at first to go against him; and had given him peace and rest from all his enemies before the present trouble came upon him, (2 Samuel 7:1); therefore he believed, that he who had delivered him in time past would deliver him again; this is the reasoning of faith, (2 Corinthians 1:9 2 Corinthians 1:10) (2 Timothy 4:17 2 Timothy 4:18).

The Septuagint, Vulgate Latin, Arabic, and Ethiopic versions, render the last clause, "from them that draw nigh unto thee"; and the Syriac version renders it, by way of petition, "deliver my soul from them that know me"; and the Targum, ``lest evil should come to me;''

for there were many with me ;

either enemies fighting with him; and so this is mentioned to show the more the power of God in his deliverance: or friends, who were on his side; all Israel and Judah, who loved David and prayed for him, as Jarchi interprets it: or the angels of God, as Aben Ezra; who being for the Lord's people, are more than they that are against them, (2 Kings 6:16); or God, Father, Son, and Spirit; and if he is for us, who shall be against us? (Romans 8:31). The Targum is, ``for in many afflictions his Word was for my help.''