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Mr. Jones, of the Manor Farm, had locked the hen-houses for the night, but was too drunk to remember to shut the pop-holes. With the ring of light from his lantern dancing from side to side, he lurched across the yard, kicked off his boots at the back door, drew himself a last glass of beer from the barrel in the scullery, and made his way up to bed, where Mrs. Jones was already snoring. (1.1)
We don't know if Mr. Jones became a drunk before or after becoming the leader of the farm, but we definitely get the idea that he's not up to his job.
The pigs did not actually work, but directed and supervised the others. With their superior knowledge it was natural that they should assume the leadership. (3.2)
Well, obviously. Check out how Orwell's narrator uses the pig's language—"natural" and "superior"—but gets in his own dig with "actually work." The animals might not get it, but we do.
At last the day came when Snowball's plans were completed. At the Meeting on the following Sunday the question of whether or not to begin work on the windmill was to be put to the vote. When the animals had assembled in the big barn, Snowball stood up and, though occasionally interrupted by bleating from the sheep, set forth his reasons for advocating the building of the windmill. Then Napoleon stood up to reply. He said very quietly that the windmill was nonsense and that he advised nobody to vote for it, and promptly sat down again; he had spoken for barely thirty seconds, and seemed almost indifferent as to the effect he produced. At this Snowball sprang to his feet, and shouting down the sheep, who had begun bleating again, broke into a passionate appeal in favour of the windmill. Until now the animals had been about equally divided in their sympathies, but in a moment Snowball's eloquence had carried them away. In glowing sentences he painted a picture of Animal Farm as it might be when sordid labour was lifted from the animals' backs. His imagination had now run far beyond chaff-cutters and turnip-slicers. Electricity, he said, could operate threshing machines, ploughs, harrows, rollers, and reapers and binders, besides supplying every stall with its own electric light, hot and cold water, and an electric heater. By the time he had finished speaking, there was no doubt as to which way the vote would go. But just at this moment Napoleon stood up and, casting a peculiar sidelong look at Snowball, uttered a high-pitched whimper of a kind no one had ever heard him utter before. (5.13)
Who needs to speak eloquently when you have a pack of attack dogs? Napoleon isn't willing to get his power honestly—if you can even call manipulating a pack of farm animals "honest." He's going to get it by brute force. Great.