It is still uncertain where Bruce spent the winter of 1306–07. Most likely he spent it in the Hebrides, possibly sheltered by Christina of the Isles. The latter was married to a member of the Mar kindred, a family to which Bruce was related (not only was his first wife a member of this family but her brother, Gartnait, was married to a sister of Bruce). Ireland is also a serious possibility, and Orkney (under Norwegian rule at the time) or Norway proper (where his sister Isabel Bruce was queen dowager) are unlikely but not impossible. Bruce and his followers returned to the Scottish mainland in February 1307 in two groups. One, led by Bruce and his brother Edward, landed at Turnberry Castle and began a guerrilla war in south-west Scotland. The other, led by his brothers Thomas and Alexander, landed slightly further south in Loch Ryan, but they were soon captured and executed. In April, Bruce won a small victory over the English at the Battle of Glen Trool, before defeating Aymer de Valence, 2nd Earl of Pembroke, at the Battle of Loudoun Hill. At the same time, James Douglas made his first foray for Bruce into south-western Scotland, attacking and burning his own castle in Douglasdale. Leaving his brother Edward in command in Galloway, Bruce travelled north, capturing Inverlochy and Urquhart Castles, burning to the ground Inverness Castle and Nairn, then unsuccessfully threatening Elgin. On 7 July 1307, King Edward I died, leaving Bruce opposed by the king's son, Edward II.