How did territorial expansion lead to the fall of the roman empire?

during the pueblo revolt, father de mora hid most of the gold in the mine and covered the entrance. he tried to take some of the gold with him, but had to leave it behind in order to escape.

the lachish letters were written by hoshaiah, a military officer stationed possibly in mareshah,   and sent to yaush, possibly the commanding officer at lachish.

the series of letters were written in carbon ink in ancient hebrew on clay ostraca, shortly before lachish fell to the babylonian army of king nebuchadnezzar in 588/6 bc during the reign of zedekiah, king of judah.