Howard Sadler with his Royal Engineers unit - 27.4.1918

Howard's comrades, who appear to have signed the back of this card-mounted photo, are:
Bert Honnor , J.M.Corrie*, N.O.Grant, F.M.Pepper*, O.Evans, W.F.Jenkins, R.J.Bridgeland and H.Macmillan.
*These names are a little indistinct and may not be correctly spelt here.
The blue and white armbands indicated that they were signallers. While that made them easily identifiable by officers needing to transmit messages and orders, it could also put them at risk from snipers who aimed to disrupt their enemies' communications.