From Chabad.org: From the day the Tabernacle was erected, it was covered by a cloud during the day, and a fire by night. When the cloud lifted, this signaled G‑d’s wish that the Jews should journey onwards — following the cloud until it came to rest in a new location of G‑d’s choosing. In some cases the Jews only stayed overnight in a particular location before the sign came for them to depart again, and on other occasions they would stay in one place for many years. This section then discusses Moses’ two silver trumpets. These trumpets were used for several purposes: 1) To assemble the nation or its leaders. 2) To signal the beginning of a journey. 3) The trumpets were blown when the Jews went to battle. 4) The trumpets were sounded when certain communal sacrifices were offered in the Tabernacle.

Silver trumpets, that’s a twist! Besides understanding the different sounds representing different instructions for the Jews (set up camp, pack up camp, meeting with Moshe, etc), which itself is curious and probably has deeper meanings, there’s the overarching question of trumpets in the first place. Luckily the Torah gives us a hint to the answer right away, as the very next instruction is for when the Jews go into battle, that they blow the same trumpets, and will thereby be successful. It could be that the trumpets conjure up memories of G-d taking care of us, and memories of us following instructions for so many years in the desert. The merits of both might help put things in perspective right before going out in battle.