I want to know the answer to the following question:
Whose plan did German armies ignore in attacking Frossard?
All the background I'm provided with is that "While the French army under General MacMahon engaged the German 3rd Army at the Battle of Wörth, the German 1st Army under Steinmetz finished their advance west from Saarbrücken.". Is that enough to answer the question?
Answer: no