Some context: Jan Zizka z Trocnova a Kalicha (Czech pronunciation: ['jan 'ZISka] ( listen); German: Johann Ziska; English: John Zizka of Trocnov and the Chalice) was a Czech general, a contemporary and follower of Jan Hus, Hussite military leader, and later also a Radical Hussite who led the Taborites. Zizka is held to be one of the most renowned military leaders by many historians and today he is widely considered a Czech national hero. He was born in the small village of Trocnov (now part of Borovany) in the Kingdom of Bohemia into an aristocratic family.
Zizka helped develop tactics of using wagon forts, called vozova hradba in Czech or Wagenburg by the Germans, as mobile fortifications. When the Hussite army faced a numerically superior opponent they prepared carts for the battle by forming them into squares or circles. The carts were joined wheel to wheel by chains and positioned aslant, with their corners attached to each other, so that horses could be harnessed to them quickly, if necessary. In front of this wall of carts a ditch was dug by camp followers. The crew of each cart consisted of 16-22 soldiers: 4-8 crossbowmen, 2 handgunners, 6-8 soldiers equipped with pikes or flails (the flail was the Hussite "national weapon"), 2 shield carriers and 2 drivers.  The Hussites' battle consisted of two stages, the first defensive, the second an offensive counterattack. In the first stage the army placed the carts near the enemy army and by means of artillery fire provoked the enemy into battle. The artillery would usually inflict heavy casualties at close range.  In order to avoid more losses, the enemy knights finally attacked. Then the infantry hidden behind the carts used firearms and crossbows to ward off the attack, weakening the enemy. The shooters aimed first at the horses, depriving the cavalry of its main advantage. Many of the knights died as their horses were shot and they fell.  As soon as the enemy's morale was lowered, the second stage, an offensive counterattack, began. The infantry and the cavalry burst out from behind the carts striking violently at the enemy, mostly from the flanks. While fighting on the flanks and being shelled from the carts the enemy was not able to put up much resistance. They were forced to withdraw, leaving behind dismounted knights in heavy armor who were unable to escape the battlefield. The enemy armies suffered heavy losses and the Hussites soon had the reputation of not taking captives.
At what battles were the Wagenburg tactics used?
A: 
Some context: Beck was born in Los Angeles, to David Campbell and Bibbe Hansen. His father is a Canadian-born arranger, composer and conductor who worked on hundreds of albums and numerous films. Beck's mother grew up amid New York's Andy Warhol Factory art scene of the 1960s, where she was a Warhol superstar, but moved to California at age 17, where she met Campbell; she is a visual artist. Bibbe's maternal grandmother was Jewish, while Bibbe's father, artist Al Hansen, was partly of Norwegian descent.
In 2000, Beck and his fiancee, stylist Leigh Limon, ended their nine-year relationship. Beck lapsed into a period of melancholy and introspection, during which he wrote the bleak, acoustic-based tracks later found on Sea Change. Beck sat on the songs, not wanting to talk about his personal life; he later said that he wanted to focus on music and "not really strew my baggage across the public lobby". Eventually, however, he decided the songs spoke to a common experience (a relationship breakup), and that it would not seem self-indulgent to record them. In 2001, Beck drifted back to the songs and called producer Nigel Godrich.  Retailers initially predicted that the album would not receive much radio support, but they also believed that Beck's maverick reputation and critical acclaim, in addition to the possibility of multiple Grammy nominations, might offset Sea Change's noncommercial sound. Sea Change, issued by Geffen in September 2002, was regardless a commercial hit and critical darling, with Rolling Stone revering it as "the best album Beck has ever made, [...] an impeccable album of truth and light from the end of love. This is his Blood on the Tracks." The album was later listed by the magazine as one of the best records of the decade and of all-time, and it also placed second on the year's Pazz & Jop Critics Poll. Sea Change yielded a low-key, theater-based acoustic tour, as well as a larger tour with The Flaming Lips as Beck's opening and backing band. Beck was playful and energetic, sometimes throwing in covers of The Rolling Stones, Big Star, The Zombies and The Velvet Underground.  Following the release of Sea Change, Beck felt newer compositions were sketches for something more evolved in the same direction, and wrote nearly 35 more songs in the coming months, keeping demos of them on tapes in a suitcase. During his solo tour, the tapes were left backstage during a stop in Washington, D.C., and Beck was never able to recover them. It was disheartening to the musician, who felt the two years of songwriting represented something more technically complex. As a result, Beck took a break and wrote no original compositions in 2003. Feeling as though it might take him a while to "get back to that [songwriting] territory", he entered the studio with Dust Brothers to complete a project that dated back to Odelay. Nearly half of the songs had existed since the 1990s.
How many albums were sold?
A: 
Some context: The Dark Knight Returns (alternatively titled Batman: The Dark Knight Returns) is a 1986 four-issue comic book miniseries starring Batman, written by Frank Miller, illustrated by Miller and Klaus Janson, and published by DC Comics. When the series was collected into a single volume later that year, the story title for the first issue was applied to the entire series. The Dark Knight Returns tells an alternative story of Bruce Wayne, who at 55 years old returns from retirement to fight crime and faces opposition from the Gotham City police force and the United States government.
Since the 1950s, when the Comics Code Authority was established, the character of Batman had drifted from his dark, violent roots. It was not until the 1970s when the character began to feature in darker stories once again; however, Batman was still commonly associated with the campy theme of the 1960s Batman TV series, and as a father figure to Robin rather than the violent vigilante he was introduced as.  In the early 1980s, DC Comics promoted Batman group editor Dick Giordano to editorial director for the company. Writer-artist Frank Miller was recruited to create The Dark Knight Returns. Giordano said he worked with Miller on the story's plot, and said, "[t]he version that was finally done was about his fourth or fifth draft. The basic storyline was the same but there were a lot of detours along the way." During the creation of the series, fellow comics writer/artist John Byrne told Miller, "Robin must be a girl", and Miller complied. Miller said that the comic series' plot was inspired by Dirty Harry, specifically the 1983 film Sudden Impact, in which Dirty Harry returns to crime-fighting after a lengthy convalescence. Miller also said his own increasing age was a factor in the plot. The series employed a 16-panel grid for its pages. Each page was composed of either a combination of 16 panels, or anywhere between sixteen and one panel per page. Giordano left the project halfway through because of disagreements over production deadlines. Comics historian Les Daniels wrote that Miller's idea of ignoring deadlines was "the culmination of the quest towards artistic independence".  The issues of The Dark Knight Returns were presented in packaging that included extra pages, square binding and glossy paper to highlight the watercolor paintings by colorist Lynn Varley.
What did they create
A:
Writer-artist Frank Miller was recruited to create The Dark Knight Returns.