sork96
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The caravan cannot pass/enter the city – it sounds normal, but the caravan has a plan – point A and point B, in principle, it can set off and arrive.
I have another thought that we can consider. What if this caravan is trying to "transfer" creatures into the city, but cannot, because there is no room for them 
UPD: Yes, it sounds strange, but logically, it can help creatures and transfer them into the city from itself like "the caravan arrived and transferred creatures to the garrison." But here it cannot, all the places in the garrison are occupied, so it cannot "transfer" them
UPD2: Well, yes, and what should be written in the game? We have strayed a bit from the thought :D How should it be written correctly? :D There is limited space there, we need to fit it into 3 words ))
"Я слишком часто имел дело с идиoтами, чтобы к троллям были какие-то претензии" © Дийкстра (The Witcher 3)