when you blow a second alarm, the camps on the south side shall set out. An alarm is to be blown whenever they are to set out.
But when the assembly is to be gathered, you shall blow, but you shall not sound an alarm.
The sons of Aaron, the priests, shall blow the trumpets; this shall be a perpetual institution for you throughout your generations.
When you go to war in your land against the adversary who oppresses you, you shall sound an alarm with the trumpets, so that you may be remembered before the Lord your God and be saved from your enemies.
Also on your days of rejoicing, at your appointed festivals, and at the beginnings of your months, you shall blow the trumpets over your burnt offerings and over your sacrifices of well-being; they shall serve as a reminder on your behalf before the Lord your God: I am the Lord your God.
In the second year, in the second month, on the twentieth day of the month, the cloud lifted from over the tabernacle of the covenant.
References for Numbers 10:11
Then the Israelites set out by stages from the wilderness of Sinai, and the cloud settled down in the wilderness of Paran.
They set out for the first time at the command of the Lord by Moses.
The standard of the camp of Judah set out first, company by company, and over the whole company was Nahshon son of Amminadab.
Over the company of the tribe of Issachar was Nethanel son of Zuar;
and over the company of the tribe of Zebulun was Eliab son of Helon.