 On 22 March Thieu ordered the withdrawal of all ARVN forces between Huế and Da Nang to fall back into an enclave at Da Nang.By 26 March, Huế and all of Quảng Trị, Thừa Thiên, Quảng Nam and Quảng Ngãi Provinces had been captured by the PAVN and Da Nang was isolated.General Trưởng organised his remaining forces, which numbered approximately 75,000 troops, into inner and outer defensive lines around the city, meanwhile the PAVN prepared to attack the city from four directions before its defenses could be properly established.