Cassander looked at the finely written scroll along with its fine seal. He could tell by its appear and its contents that it was written by someone with no real knowledge of warfare, and by its aesthetic, probably a wealthy aristocrat. People should know when they are conquered, he mused. Immediately, Cassander called a council of war with Lysimachus, his ally. They agreed that an outright battle was necessary. Already, the Greeks were shown to be stubborn and unruly. He would ultimately need to teach them a lesson worthy of them remembering.
Cassander would march out to meet the relief force on the field of battle, but would ultimately refuse to allow the besieged forces to join them. Instead, he would leave behind a garrison to prevent them from joining the battle. Orders were given to prepare breakfast still in the night, and then march outside before dawn, leaving behind a token force to guard the walls. (This same strategy was used by Scipio Africanus at the Battle of Ilipa) As the lines of communications are cut by the siege walls, the besieged are unlikely to know about the battle until it is already upon the relief army. Cassander hoped to take the enemy relief force by surprise. Though clearly they would muster, they would be slightly disorganized and without breakfast for a long day of fighting.
Ultimately, the battle should be pretty straight forward. The Macedonians are to march rapidly upon they Aetolians at daybreak and force them to muster. The goal is to avoid a drawn out skirmish. The right flank shall be heavily loaded with Elite Shock infantry, including the entirety of the Alexandrian Argypsiades and Thessalian Cavalry, along with Hypastists and Cassandrid Argypsiades, and the heavy cavalry. The battle plan is for a classic hammer and anvil approach, in which the infantry charge, and move to pin the enemy infantry, while the heavy cavalry moves to flank and delivers the knock-out punch.
Back at the Camp, cooking fires are ordered to be left burning to give the illusion and subterfuge that more men are guarding the camp than truly are. A sally is expected, however, reserves will be provided. With the existing soldiers, the Pezhetairoi are ordered to forsake their Sarissas and adopt closer range, and skirmishing weapons suited to defending the wall against any potential sally. The Mercenary Hippeis will dismount and help to man the walls, but some of their number will remain mounted and, at an opportune time, withdraw to the outer countervallation wall and return to the inner circumvallation wall blasting trumpets at will, giving the illusion to the sallying army that Cassander's forces have returned victorious to continue the siege. (This is part of the tactic that Julius Caesar used during the siege of Alesia, where he sent his cavalry out to pretend to bring in reinforcements).