Don't use messenger bug, use signals (fires, bugs making pyramids, whatever). Especially for simple communication ("the enemy is over here").
They did a study in England to see how effective this could be (given the claim of signal fires used in 1066) and found that you could get the message from Edenburgh to London in ~45 minutes... (Remember, we're talking almost 1000 years ago!)
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Drunkard's Walk Forum Moderator and Prereader At LargeDrunkard's Walk Forum Moderator and Prereader At Large
They did a study in England to see how effective this could be (given the claim of signal fires used in 1066) and found that you could get the message from Edenburgh to London in ~45 minutes... (Remember, we're talking almost 1000 years ago!)
Offsides
Drunkard's Walk Forum Moderator and Prereader At LargeDrunkard's Walk Forum Moderator and Prereader At Large