Asterix joke: "The Romans, upon learning that the English requested a daily ceasefire from 2pm to 4pm because they were having tea decided to attack only between 2pm and 4pm". Obviously, that's fictional but you get the idea.
In Asterix in Britain https://asterix.fandom.com/wiki/Asterix_in_Britain the Romans attack during the time the British are having their hot water - with maybe a little bit of milk in it.
Before the final battle when all seems to be lost because the barrel of magic potion was sunk in the river Asterix announces that they have the makings of the magic potion (pulling some herbs out of his pocket) - synopsis from link above:
"Finally reaching the independent village, Asterix eases the Britons' disappointment by claiming he carries herbs to remake the potion; these are later revealed to be tea. With a psychological boost, the village prevails against the Romans. Asterix and Obelix return home to the inevitable feast. The Britons like the tea so much, they proclaim it shall be their national drink."
I admit, retconning your arch-foe's national non-alcoholic drink of choice is fairly grand, but I feel like you buried the lede there.
The Romans at this time were so incompetent at naval warfare that their only significant defeats in the war were losing their entire fleet to bad weather (more than once).
[0]: https://en.m.wikipedia.org/wiki/Corvus_(boarding_device)