what was the impeachment of president johnson?

Question

what events led to his impeachment
why was he impeached
what was the result of the trial

Answer 1

There were two attempts to impeach him, both failed. The first was simply a vast list of complaints. The attempted failed to leave the house.
The second attempt was based on violating the Tenure of Office Act. An impeachment trail was commenced, however the senate did not have sufficient votes to find him guilty.

Answer 2

If I remember right there were two attempts to impeach him and he was acquitted. As to the reasons, I'm afraid it's been way too long since history class to remember. Do a web search for that.