Anchor: The fortress was completed in 1540 to protect the town against the Ottoman threat.
Entailed: The fort was built in 1540 to protect them against the Ottomans.
Contradiction: The wall was built to protect the Ottoman's from being conquered. 
Contradiction: Leadership doesn't matter much to organizations.
Contradiction: The sun-dial takes the shape of a dome and is accurate to half a second.
Contradiction: The men are walking through the desert.
Contradiction: How are you so knowledgeable?