Trumpet: To Summon Soldiers by Joab
Source: Nav
2 Samuel 2:28
So Joab blew the ram’s horn, and all the troops stopped; they no longer pursued Israel or continued to fight.
2 Samuel 18:16
Then Joab blew the ram’s horn, and the troops broke off their pursuit of Israel because Joab had restrained them.
2 Samuel 20:22
Then the woman went to all the people with her wise counsel, and they cut off the head of Sheba son of Bichri and threw it to Joab. So he blew the ram’s horn and his men dispersed from the city, each to his own home. And Joab returned to the king in Jerusalem.