Greetings!
Probably the best way to introduce the subject, yet go beyond merely restating it, is to inject an opinion about it, adopting a position with regard to the merits of the plan. For example, you might want to lead with something like this:
Schlieffen's plan to launch and win a war on two fronts simultaneously, inspired by Hannibal's destruction of the Roman Army at the Battle of Cannae, was a brazen, yet intrinsically flawed concept which relied on an underestimation of the enemies' strengths.
You might then want to go on to say that although the weaknesses in the plan led to its initial failure, the Germans were able to regroup sufficiently quickly to dig into the trench warfare that would make the first World War drag on for the next several years.
I hope this helps to give you some ideas!
Thanks,
Sarah, EssayForum.com
Sarah, EssayForum.com