I'm not 100% on this, but I believe it had something to do with air shortage. The birds were mostly male, which meant they sang. As strange as it may be to bring a noisemaker into a trench where you dig for your life, I'm fairly sure they were an indication of air shortage; what with collapses and all.
Based off my own ingenuity, I'd say that they may have been used as a distraction method as well, to lead enemies into traps.
Once again, not 100%, but there are some possibilities.
Another viewpoint: I think ,probably, to detect poison gas used by the enemy.
The used birds to send letter's. They put a elastic band around there leg and put the note through it
Trenches were a trademark of the first World War. They were extensive and elaborate. They were not used in World War II. Are you trying to find out the length of ALL the trenches together?
No. Trenches were used in wars as far back as history is recorded. Trenches were used in the Revolutionary war in the US. Some of these trenches can still be seen at the scene of some battlefields such as Gettysburg, Pennsylvania and Yorktown Virginia.
Reserve trenches were used as supplies for the trenches out the front. In world war one, they had come up with a technique of hiding in trenches before they fight. To do this properly, they had made them zig-zags. The trenches on the front line were where the soldiers would fight from. Reserve trenches were used in case these people had anything happen to them and they needed to use more trenches and more men. Throughout the war, the conditions of the front line trenches became worse as the communication and reserve trenches improved. I hope that helped :)
sniping
The used birds to send letter's. They put a elastic band around there leg and put the note through it
Trenches were a trademark of the first World War. They were extensive and elaborate. They were not used in World War II. Are you trying to find out the length of ALL the trenches together?
Trenches were used in both WWI and WWII.
The word 'cages' is not a standard collective noun; cages is the plural form for the singular, common noun, cage. However, it can be used as a collective noun for whatever is appropriate, for example, cages of bears, cages of birds, cages of pets waiting for adoption, etc.
Canaries were used in mines to detect deadly gas.
No. Trenches were used in wars as far back as history is recorded. Trenches were used in the Revolutionary war in the US. Some of these trenches can still be seen at the scene of some battlefields such as Gettysburg, Pennsylvania and Yorktown Virginia.
turtles
to defend against the dragons
When they used trenches why they...
Reserve trenches were used as supplies for the trenches out the front. In world war one, they had come up with a technique of hiding in trenches before they fight. To do this properly, they had made them zig-zags. The trenches on the front line were where the soldiers would fight from. Reserve trenches were used in case these people had anything happen to them and they needed to use more trenches and more men. Throughout the war, the conditions of the front line trenches became worse as the communication and reserve trenches improved. I hope that helped :)
sniping
A reserve tranch was one of three main trenches, all connected up by communication trenches. The reserve trenches were at the back and, from the name, were used as reserves. The next trenches were support trenches, to support the fighting. Then you had the Front trenches, right next to No Man's Land. Hope this helped :D