The AI is usually very agressive to enemy armies that dare cross borders; going as far as to pursue them into enemy territory. Therefore if you have your diversive stacks conventiently located within marching distance of Makedonian territory you should be able to lure Ptolemaic forces into Makedonian territory.
With luck the Makedonians will respond to the Ptolemaioi pursuers likewise... In any case it should increase the amount of battles per turn between Makedonian and Ptolemaic forces; thereby whittling both powers down a bit further. And it's all about buying tine and diverting Ptolemaioi eyes...
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