Summarize
Item 1: Official letter, dated 20 Oct 69, from Vu Thanh Hai instructing the gathering of enemy activities. Item 2: Official letter, dated 24 Oct 69, from Hai Khoi to Tam Hai and Muoi Phuong about meeting cancellation due to enemy attacks. Item 3: Official letter, dated 30 Oct 69, from Le Thong directing emulation campaign. Item 4: List of weapons by several units.