1)
How is Hashem's eye to those who fear Him?
1.
Malbim: He fights for them, and shames those who ride on horses.
2)
Why does it say "la'Meyachalim l'Chasdo"?
1.
Radak: Those who trust in their armies or strength will not be saved, only Yir'ei Hashem who hope for His Chesed.
2.
Malbim: This is a second reason for His Hashgachah over them, in addition to being Yir'ei Hashem.