1)
Why does it say "Nasan Yado"?
1.
Rashi: He promised in faith and gave his hand in a Bris.
2.
Radak: Giving the hand shows love and Shlomo, like Yehu said to Yehonadav "Tenah Es Yadecha" (Melachim II, 10:15).
3.
Malbim: In addition to belittling a curse and annulling a Bris, he gave his hand. I.e. he already ceased the war, i.e. after the city was conquered, and even so he remained in his rebellion and wanted to flee to Egypt. How will he escape?! This is like it said "v'Hinei Shesulah ha'Sitzlach" (10) ? how will he succeed when he uproots from his place to flee to Egypt?!
