URAS recently coordinated a 5 vs 1 assault on a major player in NYC. He survived because he was able to instantly teleport (transfer) his 6500-size army from a Canadian base to his NYC base WHILE being attacked. His large army effectively became a huge, self-repairing wall. Without this capability his 1000 man NYC army would have survived 8-9 rounds of attacks (90 minutes).
I would like to propose a timer for army transfers, with increasing time for increasing distances.