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So, the video was recorded in "blitz" mode, with a 4-minute time limit and no opponent, which doesn't leave much time for thinking (usually, the opponent's turn is used for planning). I didn't want to attack the Monks; one Jester wasn't enough, and they didn't provide any growth, as they don't have dwellings. And the Gnolls simply didn't make it halfway across the map in one turn. Also, if you don't build archers at the start, I usually assess the situation like this: how many of them are available, and is it worth upgrading them after building the structure (if there are few, I sometimes skip them entirely in the first week), but at least a few Knights should be produced in the Castle in this scenario.