Which were about six hundred. — This is the only note we have in this part of the narrative of the rapid increase of the number of “men-at-arms” who joined David.
Whithersoever they could. — That is, the armed camp of David was pitched without any fixed plan or aim. Probably the force was marched in the direction of any Philistine raid, and it carried on thus on behalf of Israel a perpetual border warfare.