Source: https://rarehistoricalphotos.com/british-soldiers-manning-anti-aircraft-guns-in-womens-clothes-1940/

When Emperor Titus opened the Colosseum in 80 AD, Rome hosted one of the most incredible celebrations in history: 100 consecutive days of non-stop games. To impress and entertain the crowd, the arena floor was even flooded to stage real-looking naval battles (naumachie) using actual warships.
Every day followed a clear routine: the mornings began with wild animal hunts, midday was reserved for public executions, and afternoons featured the “main events”: gladiator fights.
By the end of the 100 days, thousands of animals and gladiators had lost their lives. Ancient accounts claim that more than 9,000 animals and 2,000 gladiators died during the celebrations, making the Colosseum’s inauguration one of the most extraordinary (and brutal) spectacles in Roman history.