Answer the question at the end by quoting:

Uriah Heep are an English heavy metal band formed in London in 1969. It has had the same lineup since 2013: lead and rhythm guitarist Mick Box, keyboardist Phil Lanzon, lead vocalist Bernie Shaw, drummer Russell Gilbrook and bassist Davey Rimmer. Of the current lineup, Box is the only remaining original member.
The lineup remained unchanged from 1986 until 2007, being veteran Mick Box at the helm, Trevor Bolder on bass, Lee Kerslake on drums, vocalist Bernie Shaw and Phil Lanzon on keyboards. Their principal tour circuit has been in Germany, the Netherlands, Scandinavia, Japan and Russia. In December 1987 they were one of the first ever Western bands to play in Soviet Russia (UB40 were the first in 1986), under Mikhail Gorbachev's policy of glasnost (Nitty Gritty Dirt Band and Elton John had already played shows there in the late 70s during the pre-Gorbachev era). At Moscow's Olympic Stadium the band played ten consecutive nights to a total of 180,000 people (following a reception that Bernie Shaw remembered as being "something like Beatlemania"), which was represented in the international press as not just an achievement for Uriah Heep but a major breakthrough for Western music in general. The concerts were recorded and issued as the Live in Moscow album, which included three new tracks. Ironically, it was this behind the Iron Curtain excursion that did well to re-establish Heep's name back at home. After a series of sell-out dates in Czechoslovakia, East Berlin and Bulgaria the band returned to Britain for the Reading Festival in August 1988, and toured the UK with The Dogs D'Amour.  Raging Silence, produced by Richard Dodd and released in May 1989, was followed by a return to the Soviet Union, concerts in Poland, East Berlin, six dates in Brazil and another British tour. "The last two years have been the most enjoyable of all my time in Heep," Trevor Bolder was quoted to say at the time. The band played in the Central TV studios in Nottingham on 29 November 1989 (the film was shown as part of the Independent TV series Bedrock and a few years later it was repeated in the Cue Music series) and celebrated its 20th Anniversary with a series of compilations and re-issues.  Produced by Trevor Bolder and released early in 1991, Different World got a mixed reception from the press (put down in Kerrang!, hailed in Metal Hammer) and sold poorly. "Yet another technically sound but artistically bland recording from Uriah Heep" (according to AllMusic) failed to chart and marked the end of the band's contract with Legacy Records. Touring incessantly, the band issued some compilations of which Rarities from the Bronze Age and The Lansdowne Tapes (featuring previously unreleased material from the early 1970s) are considered most noteworthy. Still the first half of the 1990s is regarded even by the Heep fans as "the wilderness years."

what is the most important fact stated in the article?

In December 1987 they were one of the first ever Western bands to play in Soviet Russia (UB40 were the first in 1986), under Mikhail Gorbachev's policy of glasnost (

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.
How did the offensive stage work?
A: The infantry and the cavalry burst out from behind the carts striking violently at the enemy,

IN: Jane was probably born at Wulfhall, Wiltshire, although West Bower Manor has also been suggested, the daughter of Sir John Seymour and Margery Wentworth. Her birth date was not recorded, but it is generally estimated as occurring in or around 1508. Through her maternal grandfather, she was a descendant of King Edward III's son Lionel of Antwerp, 1st Duke of Clarence. Because of this, she and King Henry VIII were fifth cousins.

Jane Seymour's labour had been difficult, lasting two nights and three days, probably because the baby was not well positioned. After the christening, it became clear that she was seriously ill. She died on 24 October 1537 at Hampton Court Palace. Within a few weeks of the death of Queen Jane, there were conflicting testimonies concerning the cause of her demise. In retrospect from the current day, there are various speculations that have been offered. According to King Edward's biographer, Jennifer Loach, Jane's death may have been due to an infection from a retained placenta. According to Alison Weir, Jane may have succumbed to puerperal fever following a bacterial infection contracted during the birth.  Jane Seymour was buried on 12 November 1537 in St. George's Chapel at Windsor Castle after the funeral in which her stepdaughter, Mary, acted as chief mourner. A procession of 29 mourners followed Mary, one for every year of Queen Jane's life. Jane was the only one of Henry's wives to receive a queen's funeral.  The following inscription was above her grave for a time:  After her death, Henry wore black for the next three months. He married Anne of Cleves two years later, although marriage negotiations were tentatively begun soon after Jane's death. He put on weight during his widowerhood, becoming obese and swollen and developing diabetes and gout. Historians have speculated she was Henry's favourite wife because she gave birth to a male heir. When Henry died in 1547, he was buried beside her, on his request, in the grave he had made for her.

How did Jane die

OUT:
she was seriously ill.