Tracer bullets are still used today and any downsides would still apply today. I have a hard time seeing any unique disadvantages particular to those used in WW1.
Tracers are more expensive to manufacture.
Tracers are more hazardous to store due to the volatile chemicals they employ to create the glowing trails.
"Tracers work both ways" an old military proverb explained more in depth below.
Tracers lose energy more quickly than standard rounds. Kinetic energy is 1/2mv^2. All bullets lose energy as v decreases, but tracers also lose m, meaning both sides of the equation drop over distance. Though how much of a difference this makes is generally too small to really concern oneself with.
Tracers can cause fires because they use volatile chemicals, and a starting a fire may or may not be to your advantage.
It is important to understand that tracers have a very specific job they perform. Namely they create a visible trail that allows the operator of an automatic weapon to see (roughly) the path his bullets are taking. At long distances a gunner can "walk" his fire on the target by pivoting the gun until he sees his tracers going to the vicinity of those whom are the targets of his ill-will. Soldiers however have often quipped that "tracers work both ways". That is while it makes it easier for the gunner to see where his rounds are going, it also makes it easier for those being shot at to see where the rounds are coming from.
sandbag
Yes. .50 caliber machine guns weren't invented for war until WWII, but other guns and artillery had large rounds. (bullets)
The two bullets fired to assasinate Francis Ferdinand (German Franz Ferdinand), archduke of Austria, were the start of WW1.
Most of them sadly died, or if they had survived the barbed wire and bullets, after the war some wrote poetry or went completely insane.
abour 1000000 Though many Russian soldiers were not even armed but simply told to run in and kill the Germans with whatever they could find.
no
Phosphorous.
I smaoke bombs and tracer bullets
It was John Pomeroy from NewZealand.
ball, blank, tracer for sure.
The 'thick green light' mentioned in this poem is the Chlorine gas used by the Germans as a chemical weapon during WW1, illuminated by the flashes of shellfire and tracer bullets.
No, tracer bullets are not legal to shoot in the state of New Mexico. Doing so can end up resulting in heavy fine fees and even jail time.
sandbag
antimony
Yes, Hollow point bullets are legal in Nevada. However, amour piercing bullets for pistols are not. Also, if you have tracer bullets (pistol or rifle), you cannot fire them on the open range due to fire danger.
Buckshot does at night, also what they call tracer rounds which are used by the military.
If you have ever been caught in an automatic weapons crossfire at night you will have seen tracer bullets collide and ricochet off at crazy angles. Those are full metal jacket bullets.