Probably refers to strength (definition may be broader)
Haggai 2:21-22 (KJV) Speak to Zerubbabel, governor of Judah, saying, I will shake the heavens and the earth; 22 And I will overthrow the throne of kingdoms, and I will destroy the strength of the kingdoms of the heathen; and I will overthrow the chariots, and those that ride in them; and the horses and their riders shall come down, every one by the sword of his brother.
Psalms 33:17 (KJV) An horse is a vain thing for safety: neither shall he deliver any by his great strength.
Psalms 147:10 (KJV) He delighteth not in the strength of the horse: he taketh not pleasure in the legs of a man.
Job 39:19-25 (KJV) Hast thou given the horse strength? hast thou clothed his neck with thunder? 20 Canst thou make him afraid as a grasshopper? the glory of his nostrils is terrible. 21 He paweth in the valley, and rejoiceth in his strength: he goeth on to meet the armed men. 22 He mocketh at fear, and is not affrighted; neither turneth he back from the sword. 23 The quiver rattleth against him, the glittering spear and the shield. 24 He swalloweth the ground with fierceness and rage: neither believeth he that it is the sound of the trumpet. 25 He saith among the trumpets, Ha, ha; and he smelleth the battle afar off, the thunder of the captains, and the shouting.
- This next verse alludes more than anything to the strength of horses, but is worth mentioning. He refers to the saving “strength” of the Lord as opposed to trusting in chariots and horses.
Psalms 20:6-7 (KJV) Now know I that the LORD saveth his anointed; he will hear him from his holy heaven with the saving strength of his right hand. 7 Some trust in chariots, and some in horses: but we will remember the name of the LORD our God.