Core Viewpoint - The article highlights the dedication of three Great Wall protectors in Qinhuangdao, showcasing their efforts in preserving this historical monument through various methods, including traditional and modern techniques. Group 1: Individual Contributions - Zhang Heshan has been patrolling the Great Wall for over 40 years, covering 6 kilometers daily and inspecting 23 watchtowers, emphasizing the importance of his role in maintaining the structure and its cultural significance [7][8]. - Zhang Peng, the leader of the Shanhaiguan Great Wall Volunteer Service Team, utilizes drones and technology to enhance the efficiency of patrols and protect the wall from illegal activities [9][10]. - Xu Guohua, a protector for over 20 years, discovered ancient brick kilns near the Banchangyu Great Wall, revealing the historical significance of the area and its role in Great Wall construction [11]. Group 2: Technological Integration - The integration of technology, such as drones and data analysis, allows for more effective monitoring and protection of the Great Wall, improving the response to potential threats [10]. - Zhang Peng's use of drones has significantly increased the efficiency of patrols, especially in difficult terrains, allowing for quicker reporting and response to illegal activities [10]. Group 3: Cultural Significance - The Great Wall is not only a physical structure but also a cultural symbol, with protectors like Zhang Heshan and Xu Guohua emphasizing the importance of preserving its history and stories [8][11]. - The discovery of ancient brick kilns by Xu Guohua highlights the historical context of the Great Wall's construction, showcasing the area's significance in military and architectural history [11].