1)
What kind of Machaneh is this?
1.
Radak: Even if it is a big camp, and I have few people.
2.
Malbim: It is people who come to fight me openly
2)
In what does he trust?
1.
Rashi: It is like he said above [Radak - "Hashem Ori v'Yish'i...] Hashem Ma'oz Chayai" (verse 1).
2.
Malbim: It is what he says after this (I ask only to sit in Beis Hashem - verse 4).