From the early Church Fathers to now.
1 Jewish · 1 Catholic
“That afterwards their children might learn to fight with their enemies, and to be trained up to war:”
“Only so that they should know. For this alone, He permitted these nations to remain, so that future generations of the Bnei Yisroel might grasp the consequence of iniquity—for it was now necessary for them to undergo martial training. Whereas earlier when they stood worshiping Adonoy. This was unknown. These wars and the art of battle. It was unnecessary.”
“And be. Hebrew, “at least, such as before knew nothing thereof.” Though war be in itself an evil, the passions of men render it necessary, and God makes use of it as a scourge, to punish the wicked, and at the same time to keep all under due restraint. (Haydock) — Too long a peace has proved sometimes fatal to states and to the virtue of individuals. In adversity we call upon God, and adhere to him with greater fervour and constancy. The Jews were so prone to evil, that, if they were permitted to enjoy tranquility for a few years, they presently forgot themselves and the author of all their good, and even turned their backs upon the only true God. Their enemies forced them to have recourse to Him. (Calmet)”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.