1)
Why does it say "Ki Yechet'u Lach"?
1.
'Rashi': Your nation is not defeated due to any lack in Your ability to save, rather, due to their sin.
2)
What is the meaning of "v'Hodu Es Shemecha"?
1.
'Rashi': Hodu" is admission, like "v'Hisvadu Es Avonam" (Vayikra 26:40). It says "v'Hodu Es Shemecha" also in verse 26, and the latter verse adds "ume'Chatasam Yeshuvun."
