Context: The Japanese defenders recognized the possibility of a renewed invasion, and began construction of a great stone barrier around Hakata Bay in 1276. Completed in 1277, this wall stretched for 20 kilometers around the border of the bay. This would later serve as a strong defensive point against the Mongols. The Mongols attempted to settle matters in a diplomatic way from 1275 to 1279, but every envoy sent to Japan was executed. This set the stage for one of the most famous engagements in Japanese history.

Question: What was built around Hakata Bay?
Answer: a great stone barrier

Question: When did Japan begin building the Hakata Bay barrier?
Answer: 1276

Question: When did Japan finish building the Hakata Bay barrier?
Answer: 1277

Question: How long was the Hakata Bay barrier?
Answer: 20 kilometers

Question: What happened to diplomatic envoys the Mongols sent to Japan?
Answer: executed