Just off the east side of that southern part of the Little Cumbrae which is included in the parish of West Kilbride, and on a low-lying turf and weed-covered rock, which, according to the ebb and the flood of the tide, is itself alternately a peninsula or an islet, there stands the ruin of an ancient castle. It is still a massive pile of masonry, the ground plan of which nearly forms a square, the difference between length and breadth being less than ten feet. Its distance from the Ayrshire coast and from Millport, on the Great Cumbrae, is about the same; and owing to the comparative inaccessibility which the two or three miles of sea give it, its interior is somewhat less dilapidated than is usually the case with similar relics of the past to be met with on the mainland. The partition walls of the several rooms have, it is true, almost disappeared, so that, for instance, the storey immediately above the vaults on the ground floor would appear to have consisted of one hall, if it were not for the fact that it contains two large chimneys. The ceilings are arched throughout, and it is doubtless due to this architectural peculiarity that each of them is still intact and supplies a solid floor for the storey immediately above. The narrow stone staircase is still practicable in its first flight, but fragmentary and rather unsafe beyond that. In its general appearance the Cumbrae castle is very similar to that of Portencross, over the water. It is probable that they both date from the same period, and are the work of the same builder. Both belonged to the Boyd family.

At the present day the Wee Cumbrae, as it is popularly called, is practically uninhabited. At its westermost point it has a lighthouse with the usual staff, and opposite the castle itself there are two houses serving, the one as a shooting-box, the other as a dwelling for the present tenant's gamekeeper. Closer examination of the island, particularly in winter, when the ground is free from bracken, reveals the remains of a dozen or more cottages, which tell of the existence in former days of a small colony on the less exposed half of it.

In the last year of the sixteenth century several of the families that composed the small population were of the name of Montgomery. The castle itself was inhabited by Robert Boyd of Badinhaith. He was a man of some initiative, and had formed a plan for the building of a harbour for "the commone welle and benefite of the haill liegeis of this realme haveing ony trade and handling in the west seyis". In the year 1599, as a first step towards the accomplishment of this praiseworthy scheme, he had purchased "eleven score of joists of oak of twenty-four foot long and a foot and a half of the square". The cost of each joist was £8, and the whole outlay amounted to £1760. Although this, being in Scots currency, represented less than £150 sterling, the sum in view of the value of money in those days was not inconsiderable.

Whatever may have been the relation in which Robert Boyd stood to the other inhabitants of the Little Cumbrae, their attitude towards him was distinctly hostile. There is good reason to believe that these immediate neighbours of his were not all respectable, peace-abiding folk, but that the island served as a convenient refuge for "rebels, fugitives, and ex-communicates". And it is quite intelligible that these outlaws did not approve of the laird's enterprise, one of the results of which would be to bring their sea-girt asylum into closer touch with the outer world and its justice. Whether for this reason or for the mere sake of plunder, it happened that one day, in 1599, some thirty men, with half a dozen of the Montgomerys as their leaders, came to the fortalice with hagbuts, pistols, culverins, swords, and other weapons, and violently, "with engyne of smythis", broke up the doors and gates, and, after having destroyed the glass windows, boards, and ironwork, "spuilzied" the furniture, together with the materials intended for the construction of the harbour. The perpetration of this outrage was followed by the forcible occupation of the castle by four of the Montgomerys, who fortified it "with men, ammunition, and armour", and "resetted within it not only the disorderit thevis and lymmaris of the Ilis, but also such other malefactors as, for eschewing punishment, resorted towards them".

The document[275] which contains the narrative of the "spulzie" on the Little Cumbrae is interesting, not only because of the glimpse which it affords of the state of the country three hundred years ago, but also, and even more, because of the minute inventory which it includes of the articles either "spulzied" or destroyed in the various parts and chambers of Boyd's castle, together with the value put upon each article or set of articles. In the first place the list indicates the internal structural arrangement of such a dwelling. It consisted of a hall, a kitchen, a chamber, a lower wester chamber and a high wester chamber, a low easter chamber, a wardrobe, a brew-house, and vaults. The contents of the several apartments do not point to luxurious appointment, even in what may be taken as a fair specimen of an ancient Scottish house of the larger and better sort.

The distinction between public rooms and bedrooms does not appear to have existed. There were two or three "stand beds", that is to say, beds with posts, as distinguished from beds that might be folded up, in each of the "chambers". Most of them were of "fir", or plain deal, and valued at £8 Scots, or 13s. 4d. sterling, each. The oak bedsteads, of which there were only two, were set down at 20 marks, or about 23s. sterling apiece. According to the same difference of wood, the "chalmer buirds", as distinct from the "fauldand buird", or dining-table of the kitchen, were worth £4 or £5 respectively. Three beds and a table constituted the sole furniture of the "low easter chalmer" and of the "high wester chalmer". The "lower wester chalmer" was the room which yielded most loot to the raiders. In a cupboard within it they found a "silver piece" of 17 oz. in weight and a cup with a silver foot weighing 7 oz., at £3, that is to say, 5s. an ounce, besides "contracts, obligations, evidents, and books, worth £2000." The same room contained a lockfast chest, which served as a repository for "a doublet and breiks of dun fustian cut out on tawny taffety, a pair of tawny worsted stockings, two linen shirts, two pairs of linen sheets, four pillowslips, two pairs of tablecloths, two broad cloths of linen of five ells in length, two broad towels, and two dozen serviettes".

In the kitchen the utensils were on a scale as moderate as that of the furniture through the whole house. The items which it supplies in the inventory are: Two brass pots, two pans, two spits, a pair of andirons, an iron ladle, a dozen and a half of plates, knives, forks, and spoons for six people, a dozen trenchers, and a folding table. The only engines of war contained in Boyd's fortalice consisted of two "cut-throat guns of iron". They were located in the hall. The whole damage done by the plunder of all the movables and the destruction of such fixtures as doors and windows is estimated at £4776, 10s. 6d. Scots, that is, well under £400 sterling. By no stretch of the imagination can the raid of the Little Cumbrae be considered an event of historical importance. It is rescued from insignificance, however, by virtue of the valuable data which it has been the indirect means of preserving for the information of posterity.