What was significant about the battle of Simme​

This battle was the first large offensive campaign run by the "new" British Empire forces in WWI. The Battle of the Somme is remembered for the debut of tanks. Tactics were developed that enabled the British to win the war.

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!

that would be the steamboat because none of the other things are forms of transportation