Watchmen - The prophets Isaiah 52:8.
The second of the trumpet - This was the signal for flight Jeremiah 6:1; Amos 3:6. Similarly the prophet’s warning was to move men to escape from God’s judgments.
Related Commentaries of Jeremiah 6:17
Jeremiah 6:17
17 Also I set watchmen over you, saying, Hearken to the sound of the trumpet. But they said, We will not hearken.