It is the trios seventh year. After the death eaters invaded the castle to aid in the murder of Dumbledore, the Order shortly appeared and protected him along with many of the students who decided to fight against the Death Eaters after Harry had informed Ron and Hermione of what was going on, and asked them to inform Dumbledore's Army. Voldemort eventually showed up and fought as well, Harry defeated him however. Leaving his soul in the loom. Harry spent the summer hunting down the remainder of the Horcruxes with the help of Dumbledore and Snape.