In an explanatory essay, or any essay, the introductory paragraph introduces (hence it's name) the main idea, or what you are going to explain. The body paragraphs go into extreme detail of what the introductory paragraphs mentioned.
His strategy Blitzkreig.
Literally meaning a lightening war, Hitler used this strategy in Poland. It was based on a co-ordinated rapid attack spearheaded by tanks and infantry along with an aerial attack by the Luftwaffe.
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1. Environment impact
2. Health/physical impact
