However, Rome's social classes were qualified rather than created by the census. It is perhaps more accurate to say therefore that the army's structure was slightly refined during this period rather than radically reformed. Prior to these reforms, the infantry was divided into the "classis" of rich citizens and the "infra classem" of poorer citizens. The latter were excluded from the regular line of battle on the basis that their equipment was of poor quality. During the reforms, this crude division of poorer and richer citizens was further stratified. The army thereafter consisted of a number of troop types based upon the social class of propertied citizens, collectively known as "adsidui". From the poorest in the "fifth class" to the richest in the "first class" and the equestrians above them, military service was compulsory for all. However, Roman citizens at this time generally viewed military service as a proper undertaking of duty to the state, in contrast to later views of military service as an unwelcome and unpleasant burden.* Boak, "A History of Rome", p. 454</ref> Whereas there are accounts of Romans in the late empire mutilating their own bodies in order to exempt themselves from military service,* Boak, "A History of Rome", p. 454</ref> there seems to have been no such reluctance to serve in the military of early Rome. This may in part be due to the generally lower intensity of conflict in this era; to the fact that men were fighting close to and often in protection of their own homes, or due to—as posited by later Roman writers—a greater martial spirit in antiquity.