What were the north and the south's military strategies at the start of the civil war and how and why did they change as the war continued?

The north's Anaconda plan was to try to cut the South in 2. First they would blockade the entire south so they could not trade with the europian countrys and to crush the ecomomy. The South Just wanted to defend there capital Richmond and defend the south and try to hold off the north. They both stuck to there plans and the south successfuly guarded Richmond for most of the war. The North successfully surrounded the south and cut them in two.