'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.