'Trained' in the Bible

When Abram heard that his relative was taken captive, he led forth his trained men, born in his house, three hundred and eighteen, and pursued as far as Dan.

Of the Gadites there separated themselves to David to the stronghold in the wilderness, mighty men of valor, men trained for war, that could handle shield and spear; whose faces were like the faces of lions, and they were as swift as the roes on the mountains;

Ephraim is a trained heifer that loves to thresh; so I will put a yoke on her beautiful neck. I will set a rider on Ephraim. Judah will plow. Jacob will break his clods.