Herodian, 1. iv. p. 147. In every Roman camp there was a small chapel near the head quarters, in which the statues of the tutelar deities were preserved and adored; and we may remark, that the eagles, and other military ensigns, were in the first rank of these deities: an excellent institution, which confirmed discipline by the sanction of religion. Lipsius de Militia Romana, iv. 5, v. 2.