Once The Weapon was built, it was used exactly four times.
The first time was the test run. The inventor was unaware of just what it was she had made, until she aimed the beam at a nearby asteroid, engaged it, and tore a hole in the fabric of everything.
Hence the capitalisation.
The second time was the demonstration, given that The Empire wanted to show the rest of the galaxy why it was worth the capital letters.
The third time was to try and end The War.
The last time, it did indeed end The War.
And Everything Else.