Kits should be moved into the tunnels at first, only a couple at a time to not raise suspicion. The warriors could say the kits are "starving to death". Or, a queen could escape during the night, taking as many kits as she can, and they say she fled to Thunderclan or Riverclan, while in reality they are living in the tunnels. There should be one or two guards at the tunnels.
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Panda1440