Answer:
1.The woodenhorse that help the Greeks take the city of Troy
2.The woodenhorse that was supposely a gift was really a plan to get into the city of Troy without being seen.
3.The Greek heroes climbed into the woodenhorse and hidden in there after they pretended like they was leaving and next morning they attack the city of Troy.
4.The last sentence add more explanation by saying they discovered the big surprise which was the Greeks inside of the woodenhorse, but it was to late meaning that they didn't see the attack coming.