The Greek that is translated as «three men» or similar in English is translated in the German New Testament translation by Berger / Nord (publ. 1999) with «two men.» The translators note (p. 530) that «just as in Acts 10:7 the soldier has only been sent for protection and does not count.»
In Acts 11:11 Berger/Nord have «two messengers and one soldier.»