translate English to French: Short commanded the gun troop to which Pelletier and Edmond Chinic were assigned. Both were included in the deal, which explains the "us" in the quote.
Short a commandé la demi-batterie à laquelle étaient affectés Pelletier et Edmond Chinic, qui sont tous les deux inclus dans la transaction, ce qui explique le « nous » de la citation.