The word '兼' of 兼仗 (Kenjo) is correctly written by using the letters of '人' (person) and '兼' (combine), and the word '仗' refers to a weapon, so that its ballpark role can be guessed by the words of 'person, combine, and a weapon.'
兼仗の「兼」は正確には「人べんに兼」、「仗」は武器、「人、兼ねる、武器」でおおよその役割は想像できよう。