No. You need a crushed concrete base of 4" below them, or some paver pads.

Uh, no, releasing the cold quickly or slowly does not change the total amount of coldness that there is to be released.

I feel like there's a lot of silly answers in here. A simple Google search reveals that yes, salt lowers the tempature of ice by melting it. Melting is an endothremic process, and it makes the mixture colder. Which basically means that it releases the cold of the ice into the environment faster.

But! Because the cold is released faster, it means it will warm faster. Because the difference in tempature between the cooler and outside is greater.

So they are half right. It does make it colder, but not for longer.

>List of conflicts in Europe

Are you joking? Arabs had a different take on the feudal system (Itqa) that was less centralized. The had multiple heads of faith, mostly terrestrial kings an emperors claiming the titles. They had a different marital structure leading to more pretenders to claims. They had a different succession system, often favoring the bold and ruthless. They lived on totally different lands with different forms of sustenance gathering. If you buy into Marx's substructure and superstructure, their dominant economic activities were different, changing every fabric of their society when compared to Europeans. Their armies were drafted differently, paid differently, drilled differently, comprised of different types of units, with different oaths to their lords, and with religion playing a different role.

You can't just wave that away with a chronological list of wars. It's not even relevant! Army cohesion is an internal affair. War is an external affair. What you've said is the worst type of history. It sounds plausible at first blush, but could not misrepresent the situation more if you had tried.