first of all iluvatar you should probably gt your copy of the two towers and read through the names of the chapters in the table of contents and as for my favorite it is a tie between helms deep and floatsam and jetsam
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You will be in awe of my knowlage of the Middle Ages!
I have a tie between The Uruk-hai and choices of master Samwise. I love the Uruk-hai chapter because it gives you the story of Merry and Pippin in more depth detail as well as you get to know the Uruk-hai better.