'Well trained' in the Bible

That day the Benjaminites mustered from their cities twenty-six thousand sword-wielding soldiers, besides seven hundred well-trained soldiers from Gibeah.

From all these troops [were] seven hundred well-trained men {who were left-handed}; each one could sling with a stone at a hair and not miss.

Ten thousand men, well-trained soldiers from all Israel, then made a frontal assault against Gibeah -- the battle was fierce. But the Benjaminites did not realize that disaster was at their doorstep.

Abijah launched the attack with 400,000 well-trained warriors, while Jeroboam deployed against him 800,000 well-trained warriors.

Abijah and his army thoroughly defeated them; 500,000 well-trained Israelite men fell dead.

All of them are skilled with a sword, well-trained in the art of warfare. Each has his sword at his side, to guard against the terrors of the night.

"Ephraim, the well-trained heifer, loves to thresh grain, so I will spare her neck. I will turn Ephraim into a pack animal. Judah will pull the plow, and Jacob will turn up the fallow ground.