Question: John Campbell, 5th Duke of Argyll retired to a castle located on the shore of what loch?

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Janey Sevilla Callander: She was the daughter of James Henry Callander of Craigforth and Ardkinglas by his first wife the Hon.Jane Plumer Erskine, but she was left an orphan by aged four by the death of her mother, then her stepmother and finally her father.  She thus became a ward of her stepmother's relation George Campbell, 8th Duke of Argyll, growing up at his Inveraray Castle and marrying his second son Lord Archibald Campbell (1846–1913) on 12 January 1869 (their children included Niall Campbell, 10th Duke of Argyll).

Loch Avich: Loch of Avich is a large freshwater loch that lies approximately 1 mi west of Loch Awe in Argyll and Bute in Scotland.  It is the second biggest loch in the Etive basin after Loch Awe.  It trends east-northeast, west-southwest and is narrowly triangular in shape.  At the southwest end of the loch is the islet "Innis Luana" on which stands the ruins of an ancient castle named "Caisteal na Nighinn Ruaidhe" (Castle of the Red Haired Maiden).  The castle may have been the original seat of Clan Campbell.  Near the north shore on the islet of "Eilean Fraoch" is the remains of a crannog.

John Campbell, 7th Duke of Argyll: John Douglas Edward Henry Campbell, 7th Duke of Argyll FRS FRSE (21 December 1777 – 25 April 1847), known as Lord John Campbell until 1839, was a Scottish peer and Whig politician.

Lochend Castle, Campbeltown: Lochend Castle (Scottish Gaelic: "Caislen Cean Loch" , Anglicised "Castle of the loch end"), was a castle located at Campbeltown, Argyll and Bute.  The castle once stood at the top of Castlehill, Campbeltown and was once occupied by Clan MacDonald of Dunnyveg.

Earl of Breadalbane and Holland: Earl of Breadalbane and Holland is a title in the Peerage of Scotland.  It was created in 1681 for Sir John Campbell, 5th Baronet, of Glenorchy, who had previously been deprived of the title Earl of Caithness.  He, as a principal creditor, had "acquired" the estates of George Sinclair, 6th Earl of Caithness who had died heavily in debt and without issue in 1670.  Campbell was consequently created Earl of Caithness in 1673, but after much litigation and even bloodshed, George Sinclair of Keiss (died 1698), second son of George, 5th Earl of Caithness (died 1643), recovered the estates, and successfully petitioned parliament regarding the earldom, which was removed from Campbell.  Sinclair's title was finally restored to him in 1681.  Deprived by parliament of the Caithness earldom, Sir John Campbell was created Lord Glenorchy, Benederaloch, Ormelie and Weick, Viscount of Tay and Paintland, and Earl of Breadalbane and Holland on 13 August 1681, with the precedency of the former patent and with the power to nominate any of his sons by his first wife to succeed him.  The titles were created with remainder to the heirs male of the son chosen to succeed him, failing which to the heirs male of his body, failing which to his own heirs male, failing which to his heirs whatsoever.  The "of Holland" part of the title derived from the fact that Campbell was the husband of Lady Mary Rich, daughter of Henry Rich, 1st Earl of Holland (see Earl of Holland).

Ian Campbell, 12th Duke of Argyll: Ian Campbell, 12th and 5th Duke of Argyll, DL, FRSA (28 August 1937 – 21 April 2001), styled Marquess of Lorne between 1949 and 1973, was a Scottish Peer and Chief of Clan Campbell.  He was also the 5th Duke of Argyll in the Peerage of the United Kingdom and Lord Lieutenant of Argyll and Bute.  In 1953, he was made a Fellow of the Royal Society for the Encouragement of Arts, Manufactures and Commerce.  He served with the Argyll and Sutherland Highlanders, earning the rank of captain.  Following his military service he worked in banking, then spent four years as a sales executive with Rank Xerox Export, regularly travelling behind the Iron Curtain.  In 1968 he took over running the dukedom's Inveraray Castle estate for his father.

Ranald MacDonald of Smerby: Ranald MacDonald of Smerby was a son of James MacDonald, 6th of Dunnyveg and Agnes Campbell, daughter of Colin Campbell, 3rd Earl of Argyll.  He was granted Smerby Castle from his father.  He was a hostage for the good behaviour of his family together with his nephew James held by Sir Lachlan Mor Maclean.  He was in charge of the garrison of troops within Loch Gorm Castle and surrendered the castle to Sir John Campbell of Cawdor on 28 January 1615.  Ranald died in 1616, and was buried at Saddell Abbey.

John Campbell, 5th Duke of Argyll: Field Marshal John Campbell, 5th Duke of Argyll (June 1723 – 24 May 1806), styled Marquess of Lorne from 1761 to 1770, was a Scottish soldier and nobleman.  After serving as a junior officer in Flanders during the War of the Austrian Succession, he was given command of a regiment and was redeployed to Scotland where he opposed the Jacobites at Loch Fyne at an early stage of the Jacobite Rebellion and went on to fight against them at the Battle of Falkirk Muir and then at the Battle of Culloden.  He later became adjutant-general in Ireland and spent some 20 years as a Member of Parliament before retiring to Inveraray Castle.

Inveraray Castle: Inveraray Castle (Scottish Gaelic "Caisteal Inbhir Aora," pronounced ] ) is a country house near Inveraray in the county of Argyll, in western Scotland, on the shore of Loch Fyne, Scotland’s longest sea loch.

Campbell of Argyll Militia: The Campbell of Argyll Militia also known as the Campbell militia, the Argyll militia, or the Argyllshire men, was an irregular militia unit formed in 1745 by John Campbell, 4th Duke of Argyll to oppose the Jacobite rising of 1745.

Supporting paragraphs: John Campbell, 5th Duke of Argyll Inveraray Castle
Answer: Loch Fyne