The Dwarves like to chop down trees to get wood for their forges. The Ents don't care for this. They were also probably more than a little upset that the Dwarves of Nogrod had just destroyed Doriath, a kingdom of their good friends the Elves. Those were sufficient motivations for them to attack.
As for the Ents not fighting orcs, they did not really have the opportunity. The big forests were away from Morgoth's area and the Ents probably did not ever have a great deal of contact with orcs during the First Age.
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...finding a path that cannot be found, walking a road that cannot be seen, climbing a ladder that was never placed, or reading a paragraph that has no...
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