What is soldierly?

Some articles on soldierly:

Myles Keogh - Career
... Keogh, describing the young Captain as "a most gentlemanlike man, of soldierly appearance," whose "record had been remarkable for the short time he had been ... detachments on dangerous and delicate service, he was alike successful, and his soldierly bearing and spirit were a model ... He appeared to a most gentlemanlike man, of soldierly appearance, and I was exceedingly glad to have him as an aide." — General George B ...