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http://www.military.com/video/operations-and-strategy/first-world-war/intense-battle-footage-from-wwi/2859621538001

This secondary source is a video that shows hand to hand combat from WW1. Hand to hand combat is where there is no weapons used.

I crawled up the trench a few feet and came upon two men trying to strangle each other. I thought, then, of motion pictures I had watched back home. Here was a more terrible drama than ever the movie camera showed. A bayonet charge is a street fight magnified and made ten thousand times more fierce. It becomes on close range almost impossible to use your bayonets. So we fought with fists and feet, and used our guns, when possible, as clubs.

- "Boys' Book of Battles" by Chelsea Curtis Fraser (1919)

This text is from a book and describes what it was like watching people fight hand to hand in world war 1.

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WW1 was the first time tanks were properly used. Although they were a new machine and did have a few problems, but they did a great deal to help a lot of the warfare in the trenches. While driving a tank you would get very hot because there was no air flow through the tank so you could only stay in the tank to a maximum of 2 hours. Driving a tank was a dangerous job because enemies could open the top of the tank and drop grandes inside.

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a) This photo was taken near Ypres in 1917. This primary source was retrieved from http://www.gutenberg-e.org/mas01/images/mas06k.html. The image demonstrates the sheer proportions of the weaponry that was used to defend against the creeping barrages. These 18 pounder guns would shoot 2-4 shells per minute which continued for 50 minutes each hour. Using the 10 minutes where they were not firing, to cool down and repair the artillery. Each fuze had to be adjusted by hand as the conditions often changed. The danger of the proximity from the creeping barrages, defending artillery and the soldiers is shown in this source.

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a) This is a photo of German artillery barrages falling on Allied trenches at Ypres during the Second Battle of Ypres in 1915, during the First World War.
This source was retrieved from the book, 'On the Fringe of the Great Fight by Colonel George G. Nasmith.' The book was published in 1917 that included this picture taken by an anonymous soldier in 1915 during the 2nd Battle of Ypres.
b) A historian could use this source when making judgements on weaponry and how advanced technology was during the First World War. This photograph would give evidence of quite advanced technology back in the day being able to create such a large impact on such little land.
c) This source is somewhat reliable because is does show the collateral damage that was caused from the barrages in the First World War, however it does not show detail, for example, who made the barrage (although we gathered that from the book), if many were killed from this and how close it was to the Allied trenches. Other than that, it tells us that there was advanced technology used in World War 1, and how the barrage created such a sheer size of impact.

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The phrase "Going over the top" was created in WW1 and referred to men climbing out of their trenches and running through no mans land trying to attack the other trench. This would rarely work and waste the lives of many men. It was almost known that when you had to go over the top you would get shot and die.