The information I'm finding on the Italian forces involved varies, especially in tanks (in one account, M11/39's are included). In general, it appears one brigade of 60th Infantry Division was at Derna wadi and the other brigade at Mechilli (but with no actual position given). One battalion of 10th Bersaglieri is given at Derna and two (XXV and XXVII at Mechilli (in reserve?), 12 75/27 guns detached from the 25a Divisione fanteria 'Bologna', battalions VI and XXl of 37 M13/40 tanks each, and unidentified units forming the Piana, Bignami, and Babini "regiments" with no mention of location. I figured the members here might know.