So we start by sending 100k troops and our 50k troops from the expeditionary force to Greece to invade them since we are at war with them. Our 100k troops and our 50k troops from the expeditionary force will link up and launch a naval invasion near Athens. Since the Greeks will never expect it If we land we will quickly send our troops to take their capital. If we successfully take their capital then we will ask them to surrender and if they do we will make a new Greece and I will do the border and stuff. If they say no then we will keep invading and send reinforcements and hopefully get the civilians on our side