In WWI, why Were Conditions in France in 1916 and 1917 so Difficult for the Australian Imperial Force

The conditions in France during WW1 for the AIF were horrendous because of the stalemate in the trenches, disease, rainy conditions and new weapons of war.
The stalemate and the war of attrition took a heavy toll on the troops of the AIF. There was constant enemy fire and the constant attacks and counter attacks to attempt to make ground shattered the soldier's morale and strength. …