Final answer:
The significant aspect of the day of the battle for Cassius is that it is the 15th of March, also known as the Ides of March. On this day in 44 BCE, Julius Caesar was assassinated by a group of senators, including Marcus Junius Brutus and Gaius Cassius Longinus.
Step-by-step explanation:
The significant aspect of the day of the battle for Cassius is that it is the 15th of March, also known as the Ides of March. On this day in 44 BCE, Julius Caesar was scheduled to appear at the Senate, and a group of senators conspired to assassinate him, including Marcus Junius Brutus and Gaius Cassius Longinus. This event marked a turning point in Roman history and had a significant impact on the political landscape of the time.