Britain had great tactics against Trench Warfare.
Their tactics worked against Germany. One British soldier said "Enemies suffered over 60,000 casualties during the first day alone. When Haig received the first causality figures on July 2, an estimate of 40,000 total casualties had died." (Haig, Douglas) This attack against Germany occurred in November 1916. Britain was able to move on because their tactic in the Trenches. Britain focused mainly on offensive skills. While German soldiers were busy thinking about whether to choose offensive or defensive to fight.
Even though Britain had great tactics against Trench Warfare, their Trenches were more technologically advanced than Germany. British troops had tunnels leading from one place to another. For example, when one part is gassed they were able to move out from the area, to safety. This gave more of an advantage to the British troops. Unlike Germany's trenches, which had blocked areas causing slow medical care for the wounded
soldiers.
German troops in the war practiced several different tactics. When Britain was able to knock out a good number of troops German troops mainly focused on defensive skills and learned how to use their trenches. The tactics that were brought up by German soldiers were going down hill. A German soldier said "Increase strength by using more firepower and less space in the Trenches." (Trench Warfare in World War I) In 1917 Germany increased firepower and strength defensively.
France had better trenches than Germany. In 1917 the French armies were close to 40,000 men because their trenches were too big to handle. A 750 Kilometer trench line for just one country is a lot. This much space was not necessary for army. There were extra spaces that were not covered causing the French this many men lost. As the days in war passed, France improved little by little on their offensive and defensive skills. France had more of an advantage because of all the extra space. Eventually in the late 1917 French adapted to their Trench and were able to fight off in their Trenches.