Sentence:  It was early August. In the Borders, there were few signs yet of a campaign that could take Scotland out of the United Kingdom. A large Y-E-S hung in separate letters from a tree on the road from Coldstream to Kelso. There wasn't a N-O to match it, but Kelso town hall flew both the <WSD>saltire</WSD> and the union jack. 
Meaning of the word marked with <WSD> tags:  The Saint Andrew's cross, the flag of Scotland.