How is the causative form of fall used in English? In the present tense, often enough,
A tree falls in the woods, but a logger falls trees as well.
but in the past tense,
A tree fell in the woods, but the logger felled a tree.
However, if it's not a tree, or if it's not a person's normal course of work to fall trees, then fell is used to mean "cause [some structure, regime, etc.] to fall."
Someone will fell that evil dynasty one day.
As far as I know "falled" is not a word, and "fell" is not a past-tense form in the causative sense.