Question

what did happened with Gulliver in first part

Answer 1

For 2 months before Gulliver leaves Lilliput, there has been a plot building against him.
The thing is, Gulliver has never had any personal experience of courts in his own country, but he has read about them and all their and infighting.
Still, Gulliver thought that the high morals of the Lilliputians would keep him safe from plots against him.
He was wrong.
Just as Gulliver is planning to visit Blefuscu, one of his friends at court comes by in the dead of night to warn him that several committees have been formed to decide what should happen to Gulliver.
Skyresh Bolgolam the admiral, Flimnap the treasurer, Limtoc the general, Lalcon the chamberlain, and Balmuff the chief justice have issued articles of impeachment for treason against Gulliver.
(By the way, the specific use of this term "Articles of Impeachment" is another historical reference. Once again, please allow us to direct you to the Lilliputian "Character Analysis" for more information.)
The lord who has come to warn Gulliver has also brought a copy of the articles of impeachment against Gulliver

Answer 2

in first part Gulliver was gone to a island name liliput.And he was very tall than that other citizens of liliput.