your questions regarding the game rules (improving the interpretation).

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2.6.2. It is possible to infiltrate the guarded area to bypass the guards at the passage if the infiltration into the area and the attack on the guards are performed in one action, without intermediate stops, overnight stays, or interaction (visiting, collecting, attacking) with any objects in the guarded area.
It is not always possible to target an enemy in one action in a way that is safe and without risk, and in such cases, misclicks can be fatal, attacking not pedestrians with oil and archers, but some dragons.