'Shield' in the Bible

“O mountains of Gilboa,Let not dew or rain be on you, nor fields of offerings;For there the shield of the mighty was defiled,The shield of Saul, not anointed with oil.

My God, my rock, in whom I take refuge,My shield and the horn of my salvation, my stronghold and my refuge;My savior, You save me from violence.

“As for God, His way is blameless;The word of the Lord is tested;He is a shield to all who take refuge in Him.

“You have also given me the shield of Your salvation,And Your help makes me great.