In the Fortress of Sacsayhuaman, the purpose of fortress is debated. In one source, it is mentioned that it was not built for a defensive purpose. The lecturer mentions that the fortress was built to protect Inca from the invaders. Fortress of Sacsayhuaman is a historical topic for TOEFL and this particular task of TOEFL writing tests the historical knowledge of the candidate. 

Even after being a language test, TOEFL iBT is a very difficult test and the topics of all the sections are much diverse. This TOEFL writing integrated task makes sure that the candidate has a slight idea of how Inca built a series of walls to stay safe from the attacks. With proper TOEFL writing preparation, candidates can secure a good TOEFL writing score. 

This integrated question is taken from a Korean book which you probably can’t purchase in your country.

Sample essay:

The author considers that the fortress was not designed for defensive purposes. The speaker questions the assertions contained in the report. The fortress, she claims, was built to defend the Inca from invaders.

Check:

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TOEFL Writing Samples for Integrated Writing - Professors on Television

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TOEFL Writing Samples for Integrated Writing - Easter Island

In the main, the author argues that the walls of the fortress are not solid. It is noted that the fortification consists of a series of walls that attackers might have crossed with large gaps between them. This statement is called into question by the speaker. She says the holes were left to protect the building materials. In addition, it notes that the natural barriers in the areas where the holes were located would have provided sufficient defense.

Second, the author notices that the wall contains various entries. The article argues that these passages were not well-secured and that the aggressors may have passed them. This claim is refuted by the professor. She points out that the entries were left because the Incas had to look at the attackers in order to formulate their strategies. She explains this by noting that the entries were often small openings to accommodate invaders.

Finally, the author states that no wells were found behind the walls. The author believed that the defenders would have died of thirst if the fortification had been blocked by the invaders. However, the lecturer claims that the attackers could not have suffered long attacks due to the high altitude of the fortification. She indicates that the defenders should have revived the attacker as the height caused her to fall.