Now it fell on a day, that Jonathan the son of Saul said to the young man who bore his armor, Come, and let us go over to the Philistines' garrison, that is on yonder side. But he didn't tell his father.
There is a reason for this in both cases.  In that of Israel's wanderings, God had rejected that generation, forbidding their entry into Canaan; and for that reason, practically no importance whatever could be attached to whatever they did during the intervening time.  For that reason, little was recorded.  Even the things which were written about that period, "were written for our examples"  (1 Corinthians 10:11 ASV), "as a warning  ... for our instruction" (RSV), and "for our learning"  (Romans 15:4).