Within two years Perdikkas went from being the head of the largest empire in the world to being assassinated by his own troops. How did this happen?
Personally, from my interpretation of the history, I believe it was from an inability to compromise. Take for example his annihilation of a number of cities in Cappadocia – namely Laranda and Isaura Palaia. Did he really have to destroy them (yes, I know Isaura Palaia destroyed themselves)?
Alexander the Great conquered such a wide territory by allowing cities and rulers to keep the status quo as long as they submitted to him. Most did. The few who didn’t – those ones were annihilated – though there were some that started as sieges and then capitulated without repercussions.
Perdikkas, though, seemed to have been non-negotiable in his demands. This quickly alienated most of the other players. On the other hand, it may have already been a lost cause. Top generals such as Antigonos and Ptolemy probably had no intentions to submit to any successor. Perdikkas just hastened the process.
His worst folly, of course, was the ill-fated crossing of the Nile. When the war elephants were sent over, they dug up a tremendous amount of silt, thus deepening the river and resulting in the drowning of roughly 2000 soldiers. Adding insult to injury, many of these were eaten by crocodiles. The army was so scarred from the encounter that they murdered Perdikkas, then accepted aid from Ptolemy.
In some respects, Perdikkas could have paid better attention to Alexander the Great‘s actions, since he desperately wanted to imitate them. Alexander wasn’t a fan of war elephants in the first place. He owned them but rarely used them, as in battle they tended to kill as many friends as foes, due to their ability to be spooked. He also preferred to cross deep rivers in small rafts or boats.
Sadly, Perdikkas failed both prerequisites for inheriting the empire: Handling Vassals 101 and River Crossings 101. With his death, any realistic chance of one man running the empire was done.
September
Kynane of Macedon hatches a plan to marry her daughter, Adea Eurydike, to Philip III. She is killed by Alketas, the brother of Perdikkas, in the process, but soldiers are so disgusted at the murder that they escort Adea to Babylon.
Antigonos Monophthalmos refuses to aid Eumenes, which angers Perdikkas.
Dionysios puts up a statue of joy in Herakleia Pontika after the death of Alexander. Exiles attempt to persuade Perdikkas to remove him, but through flattery he is able to remain in power.
July
September
Adea Eurydike demands a share of the regency of Macedon after the death of Perdikkas.