 Complete the following phrase:  It is still uncertain where Bruce spent the winter of 130607. 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 