Ok Olga mou, a bit chaotic but anyway...
To Join NATO Georgia had to solve all territorial disputes, this gives you a hint of why they could attack Osetia. They also used Artillery usually used for Aerial (field) bombardments inside the city hence the number of civilians died in such short period of time. This is not the war with Georgia, this is the war with Saakashvili... i will point out again that both nations were too close for so many years until one Harward educated wanker came in and started reforms.