2 Samuel 2: "And David said the bow should be learned in Israel."
I don't know why you have quoted this Jacob and how it advances the discussion. I presume you mean the previous chapter 2 Sam 1?
In any case Spurgeon delivered a sermon on this:
http://www.spurgeongems.org/vols28-30/chs1694.pdf
From which I quote:
"Why is the military order concerning the use of a certain instrument of war inserted here, when the passage is full of lamentation?” If any ask, I say, I answer most fitly, as
I shall have to show you—it was the best memorial of that skillful archer, Jonathan, and of the other princes who had
fallen by the arrows of the Philistines, that from the disastrous day of their slaughter, David caused his own tribe, over
which he had chief power, to be trained in the use of that special weapon of war."
"I have more faith in prayer than in police and prisons. In any time of national need, the men that save a nation are
the men of prayer! What? Not the wise statesmen? Certainly, wise statesmen—but who makes them wise? God has power
over all minds and, in answer to the prayer from this pulpit, He can visit yonder mind in St. Stephen’s! From a humble
cottage in the western highlands, there may go up to God a cry that shall come down upon the Prime Minister and direct
his thoughts! Remember what Queen Mary used to say when she tried to bring popery back to Scotland? She said that she
was more afraid of John Knox’s prayers than of all the armies that the Scottish lords could get together! She was right,
for once! When men overlook prayer, they overlook the greatest factor in human affairs! The mystic rod of God is still in
the hand of many a Moses among us—a rod which brings victory to Israel and defeat to Amalek."
There is some wisdom here, though I think the context of 2 Samuel 1 doesn't gel with the discussion at hand.