1 Topic sentence. 2 The meaning of the topic sentence made clearer; the new conception of history defined. 3 The definition expanded. 4 The definition explained by contrast. 5 The definition supplemented: another element in the new conception of history. 6 Conclusion: an important consequence of the new conception of history.
In narration and description the paragraph sometimes begins with a concise, comprehensive statement serving to hold together the details that follow.
The breeze served us admirably.
The campaign opened with a series of reverses.
The next ten or twelve pages were filled with a curious set of entries.
But this device, if too often used, would become a mannerism. More commonly the opening sentence simply indicates by its subject with what the paragraph is to be principally concerned.
At length I thought I might return towards the stockade.
He picked up the heavy lamp from the table and began to explore.
Another flight of steps, and they emerged on the roof.
The brief paragraphs of animated narrative, however, are often without even this semblance of a topic sentence. The break between them serves the purpose of a rhetorical pause, throwing into prominence some detail of the action.