Why did the people add the word "Anachnu"?
Ramban: Following Moshe's statement (in Pasuk 39, that their children would enter the land and not them, they retorted that they and not their children would go and fight the Cana'anim.
What is the translation of "Vatahinu"?
Rashi and Rashbam: 'And you availed yourselves to go up ... '. 1
Targum Onkelos and Targum Yonasan: 'And you began to ascend the mountain'.
Da'as Zekenim, Rosh: From a drop, the Hin (a measure) was filled. Our measure [of sin] was filled [after which we were punished] through a small matter; Hashem was angry with us for a small matter.