rev·eil·le 
/ˈrɛvəli, Brit rɪˈvæli/ noun
/ˈrɛvəli, Brit rɪˈvæli/ noun [noncount] military : a signal given on a musical instrument (such as a bugle or drum) in the early morning to call soldiers or sailors to duty
▪ He awoke at reveille.
▪ He awoke at reveille.
