No camp, just wondering

[Glactophagos]

Hello,
After scouring the rules for an answer, I end up here, asking/proposing:

Say I have an all-mounted army, enabling me to choose the No camp option. After some testing I decide to take an ally that has some mandatory infantry.
I've always assumed that this now forces me to take a camp. Was I correct?
Still, what is the reasoning behind this? One might argue that the main army determines this sort of thing, as the allies are in a way just 'guests' and might even decide to bugger off all together...

Any thoughts?
Huub

[nikgaukroger]

If the army, including allies, has any unmounted infantry you cannot take No Camp.

Why is logistics basically. No camp is allowed to armies who are vary mobile and able to forage extensively and operate at a significant distance from their camp - infantry (nellies, artillery, etc.) restricts them doing this so they require a camp.

[Glactophagos]

Cheers, clear enough.