In convoy
Definition 1 of 1
Pro Tip 1/3Military Origin
Originally military term for ships or vehicles traveling together for mutual support and protection. 
The naval ships advanced in convoy to protect the cargo vessels.
Pro Tip 2/3Implies Order
Suggests movement in an organized, controlled manner, often in a single file or arranged formation. 
Tourists followed the guide in convoy through the narrow streets.
Pro Tip 3/3Safety in Numbers
Conveys the idea of strength and safety when traveling together as a group in potentially hazardous conditions. 
The hikers trekked in convoy across the bear-populated forest.