53 BC - As a quaestor, Cassius served under Marcus Licinius Crassus and saved the remnants of the Roman army defeated by the Parthians at Carrhae (modern Harran, Turkey).
52-51 BC - Cassius served under Marcus Licinius Crassus and repelled the Parthian attacks on Syria.
49 BC - Cassius commanded part of Pompey's fleet.
48 BC - Cassius became one of Caesar's legates.
44 BC - He was the prime mover in the conspiracy to assassinate Julius Caesar.
43 BC - He became one of the conspirators against Caesar. After the murder he left Rome for Syria where he defeated Publius Cornelius Dolabellawho had been assigned Syria by the Senate.
42 BC - Died near Philippi, Macedonia [now in Greece].
- Cassius was defeated by Mark Antony and ordered his freedman to kill him near Philippi.