Answer the question at the end by quoting:

Simon & Garfunkel were an American folk rock duo consisting of singer-songwriter Paul Simon and singer Art Garfunkel. They were one of the best-selling music groups of the 1960s and became counterculture icons of the decade's social revolution, alongside artists such as the Beatles, the Beach Boys, and Bob Dylan. Their biggest hits--including "The Sound of Silence" (1964), "Mrs. Robinson" (1968), "The Boxer" (1969), and "Bridge over Troubled Water" (1970)--reached number one on singles charts worldwide. Their often rocky relationship led to artistic disagreements, which resulted in their breakup in 1970.
The duo's fourth studio album, Bookends, was recorded in fits and starts over various periods from late 1966 to early 1968. The duo were signed under an older contract that specified the label pay for sessions, and Simon & Garfunkel took advantage of this indulgence, hiring viola and brass players, as well as percussionists. The record's brevity reflects its concise and perfectionist production. The team spent over 50 studio hours recording "Punky's Dilemma", for example, and re-recorded vocal parts, sometimes note by note, until they were satisfied. Garfunkel's songs and voice took a lead role on some of the songs, and the harmonies for which the duo was known gradually disappeared. For Simon, Bookends represented the end of the collaboration and became an early indicator of his intentions to go solo. Although the album had been planned long in advance, work did not begin in earnest until the late months of 1967.  Prior to release, the band helped put together and performed at the Monterey Pop Festival, which signaled the beginning of the Summer of Love on the West Coast. "Fakin' It" was issued as a single that summer and found only modest success on AM radio; the duo were much more focused on the rising FM format, which played album cuts and treated their music with respect. In January 1968, the duo appeared on a Kraft Music Hall special, Three for Tonight, performing ten songs largely culled from their third album. Bookends was released by Columbia Records in April 1968. In an historical context, this was just 24 hours before the assassination of civil rights movement activist Martin Luther King Jr., which spurred nationwide outrage and riots. The album debuted on the Billboard Top LPs in the issue dated April 27, 1968, climbing to number one and staying at that position for seven non-consecutive weeks; it remained on the chart as a whole for 66 weeks. Bookends received such heavy orders weeks in advance of its release that Columbia was able to apply for award certification before copies left the warehouse, a fact it touted in magazine ads. The record became the duo's best-selling album to date: it fed off the buzz created by the release of The Graduate soundtrack album ten weeks earlier, creating an initial combined sales figure of over five million units.  Davis had predicted this fact, and suggested raising the list price of Bookends by one dollar to $5.79, above the then standard retail price, to compensate for including a large poster included in vinyl copies. Simon instead scoffed and viewed it as charging a premium on "what was sure to be that year's best-selling Columbia album". According to biographer Marc Eliot, Davis was "offended by what he perceived as their lack of gratitude for what he believed was his role in turning them into superstars". Rather than implement Davis' price increase plan, Simon & Garfunkel signed a contract extension with Columbia that guaranteed them a higher royalty rate. The lead single "Mrs. Robinson" became, at the 1969 Grammy Awards the first rock and roll song to receive Record of the Year; it was also awarded Best Contemporary Pop Performance by a Duo or Group.

did something happen in 1967?

The team spent over 50 studio hours recording "Punky's Dilemma", for example, and re-recorded vocal parts, sometimes note by note, until they were satisfied.

IN: Archduke Charles of Austria, Duke of Teschen (German: Erzherzog Carl Ludwig Johann Joseph Laurentius von Osterreich, Herzog von Teschen; 5 September 1771 - 30 April 1847) was an Austrian field-marshal, the third son of Emperor Leopold II and his wife, Maria Luisa of Spain. He was also the younger brother of Francis II, Holy Roman Emperor. Despite being epileptic, Charles achieved respect both as a commander and as a reformer of the Austrian army.

The caution which the archduke preached so earnestly in his strategic works, he displayed in practice only when the situation seemed to demand it, though his education certainly prejudiced him in favor of the defensive at all costs. He was at the same time capable of forming and executing the most daring offensive strategy, and his tactical skill in the handling of troops, whether in wide turning movements, as at Wurzburg and Zurich, or in masses, as at Aspern and Wagram, was certainly equal to that of any leader of his time, with only a few exceptions.  According to the Encyclopaedia Britannica Eleventh Edition, his campaign of 1796 is considered almost faultless. That he sustained defeat in 1809 was due in part to the great numerical superiority of the French and their allies, and in part to the condition of his newly reorganized troops. His six weeks' inaction after the victory of Aspern is, however, open to unfavorable criticism. As a military writer, his position in the evolution of the art of war is very important, and his doctrines had naturally the greatest weight. Nevertheless, they cannot but be considered antiquated even in 1806. Caution and the importance of strategic points are the chief features of his system. The rigidity of his geographical strategy may be gathered from the prescription that "this principle is never to be departed from."  Again and again he repeated the advice that nothing should be hazarded unless one's army is completely secure, a rule which he himself neglected with such brilliant results in 1796. Strategic points, he says, not the defeat of the enemy's army, decide the fate of one's own country, and must constantly remain the general's main concern, a maxim which was never more remarkably disproved than in the war of 1809. The editor of the archduke's work is able to make but a feeble defense against Clausewitz's reproach that Charles attached more value to ground than to the annihilation of the foe. In his tactical writings the same spirit is conspicuous. His reserve in battle is designed to "cover a retreat."  The baneful influence of these antiquated principles was clearly shown in the maintenance of Koniggratz-Josefstadt in 1866 as a strategic point, which was preferred to the defeat of the separated Prussian armies, and in the strange plans produced in Vienna for the campaign of 1859, and in the almost unintelligible Battle of Montebello in the same year. The theory and the practice of Archduke Charles form one of the most curious contrasts in military history. In the one he is unreal, in the other he displayed, along with the greatest skill, a vivid activity which made him for long the most formidable opponent of Napoleon.  He was the 831st Knight of the Order of the Golden Fleece in Austria.

Was he accomplished in writing as well?

OUT:
his doctrines had naturally the greatest weight.