Or could Chuck Norris do it on his own?
Level it and create terror.
Absolutely the potential would be there to recreate power, and possibly to eventually refine fuels, although as stated fuels might take years. Crude chemical weapons would not take years.
With electricity alone however, you have thermal imaging and light amplification. Never let Roman forces rest at night. Even fabricated crossbows are going to wither forces who can't see.
When does the film hit?