A missing object of the verb 'include'

At Messana the force from Rome came face to face with a force from Carthage. Carthage saw Rome's move as a threat to its interests in Sicily but it attempted conciliation. Carthage asked that Rome withdraw its troops. But proud Romans called on their city to stand up to Carthage. Some claimed that Carthage's control over the strait between Italy and Sicily was a danger to Rome's security. And, as with the Athenians at the outbreak of the Great Peloponnesian War, there was little reluctance and caution about going to war, including among the civilian farmer-soldiers who would fight the war. With this swagger and willingness to war, a new era was beginning.
[The First Punic War and a New Spirit for Empire http://www.fsmitha.com/h1/rome05.htm]

I'd like to know why an object of the transitive verb "including" is missing.
Thank you in advance for your help.