Well, the Dark Ages get a bad rap that is undeserved in many ways. There was an explosion of agricultural tech and method. I have to say though, that the whole period had more to do with the power/knowledge vacuum left in the wake of the fall of the Roman Empire. I don't think that the Roman Empire could have stumbled along ad infinitum. They compartmentalized the knowledge they did have (which directly contributed to or perhaps even led to its loss in the absence of their social structure). Their system of governance wasn't sophisticated enough to effectively rule the territory they had claimed. They had found the limits of their military machine (and others had been adopting their weapons and tactics, with an aim to gain power for themselves). Environmental pressures where making life difficult all across The Med and Europe. Christianity was just one of the problems that they had, they were circling the drain without it.
I am the Infantry. I am my country’s strength in war, her deterrent in peace. I am the heart of the fight… wherever, whenever. I carry America’s faith and honor against her enemies. I am the Queen of Battle. I am what my country expects me to be, the best trained Soldier in the world. In the race for victory, I am swift, determined, and courageous, armed with a fierce will to win. Never will I fail my country’s trust. Always I fight on…through the foe, to the objective, to triumph overall. If necessary, I will fight to my death. By my steadfast courage, I have won more than 200 years of freedom. I yield not to weakness, to hunger, to cowardice, to fatigue, to superior odds, For I am mentally tough, physically strong, and morally straight. I forsake not, my country, my mission, my comrades, my sacred duty. I am relentless. I am always there, now and forever. I AM THE INFANTRY! FOLLOW ME!