Answer: The speech that your are talking about is about the need for volunteers to serve in the army at the time.
Explanation: The reason I can summarize this is because the first thing he said is "the proclamation calling for volunteers to serve in the army of the united states." which is basically a fancy way of saying he is obligated by his country to ask for more people to start joining the army. The second thing is that he asks for at least 125,000 soldiers to join to fight for the cause, in order to protect the homeland. Then he signs off by saying that he will immediately be contacting the war department to check how many people listened to his request.
