In the spring, at the time when kings march out to war, David sent out Joab and his servants with the whole army of Israel. They destroyed the Ammonites and besieged Rabbah, but David remained in Jerusalem.
Here is, I. David's glory, in pursuing the war against the Ammonites, Sa2 11:1. We cannot take that pleasure in viewing this great action which hitherto we have taken in observing David's achievements, because the beauty of it was stained and sullied by sin; otherwise we might take notice of David's wisdom and bravery in following his blow.
Commenting on 2 Samuel 11:1-5
And it came to pass, that after the year was expired,.... Or at the end of the year, as the Targum, which concluded with the month Adar or February, the spring of the year: at the time when kings go forth to battle; in the month Nisan, as the Targum on Ch1 20:1; adds, the same with Abib, which was the first month of the...
And it came to pass, after the year was expired, at the time when kings go forth [to battle], that David sent Joab, and his servants with him, and all Israel; and they destroyed the children of Ammon, and besieged Rabbah. But David tarried still at Jerusalem. (a) The year following about the spring time.