 Complete the following phrase:  From 7 to 21 July, Dumas commanded the invading armys cavalry as it marched south from Alexandria to Cairo. Conditions of heat, thirst, fatigue, and lack of supplies for the troops on the desert march were harsh; there were a number of suicides. While camped in Damanhour, General Dumas met with several other generals Lannes, Desaix, and Murat. They vented criticisms of Napoleons leadership and discussed the possibility of refusing to march beyond Cairo. Dumas soon participated in the 