Can you alone rally attack on a zombie lair and win without any troop joining you?

Actually when you only started to play the game, there are 2 NPCs, who will join your rallies. But, when you reach more higher levels, they'll stop to appear. Now I have lvl 9 HQ and they are still here.

It's hard to say when the NPCs fall off in my experience, but you do have them early game. I went all the way to HQ19 with NPCs to help, moved to another state, then suddenly couldn't solo Level 10 layers anymore, because the NPCs fell off. I have no idea what it's tied to..but it's not HQ level.

Not your HQ level, but the level of the Zombie Lair

I was able to attack a Zombie Lair level 10 with the Two NPCs. I think it may relate to how overpowered you are, relative to what you are attacking.

At least one other player will need to send troops to your rally for it to start. The other player only needs to send 1 of their troops if they wish, so they do not incur losses. But you cannot rally on your own. Winning will be down to the strength of your troops (and any that join).

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