"Taking" a place or landmark means to take control of it. Alternate translation: "have taken control of the city's water supply" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here Joab speaks of himself when he is actually referring to himself and his soldiers. Alternate translation: "My soldiers and I have fought ... my soldier and I have taken" (See: [[rc://en/ta/man/translate/figs-synecdoche]])