For more than a millennium, the Theodosian Walls protected Constantinople from myriad of enemies
They also kept the Empire safe, as more than once the Romans were on a brink, with enemy's plans thwarted by imposing ramparts.
In facts, the Walls would not be breached until May 1453, doing their duty through entirety of the Middle Ages
And that role would continue till the early 20th century. As it can be seen on this 1934 photo (colorised)
Truly one of the most magnificent achievements of the Roman Empire
This is as close as we get to a Celtic war horn.
A war instrument meant to intimidate, to shake the air, to hit people in the chest.
Hearing it today gives you that same instinctive reaction the Celts probably aimed for.
The Carnyx 🔥