Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Q: In the mean time, Maha Nawrahta opened the southern front on 23 October 1765 in three directions. He had 20,000 to 30,000 under his command. A small army invaded by the Three Pagodas Pass towards Suphanburi. Another small army invaded down the Tenasserim coast towards Mergui and Tenasserim town. However, the main thrust of his attack was at Kanchanaburi. His 20,000-strong main southern army invaded via the Myitta Pass. Kanchanaburi fell with little resistance. The main reason for the quick fall of Kanchanaburi could be that the Burmese were more battle-hardened. But it could also be that the Siamese command miscalculated where the Burmese main attack would come from, and had not sufficiently reinforced the fort to withstand a major attack. Judging by the Siamese chronicles' reporting of the main attack route, the Siamese command appeared to have believed that the main Burmese attack would come from the Gulf of Siam coastline, instead of the most obvious and shortest route via Kanchanaburi. The Siamese sources say that Maha Nawrahta's main invasion route came from southern Tenasserim, crossing the Tenasserim range at Chumphon and Phetburi. The path is totally different from the Kanchanaburi route reported by the Burmese chronicles. Historian Kyaw Thet specifically adds that the main attack route was via the Myitta Pass.

A: How many Maha Nawrahta opened the southern front?
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Q: Energy from the Sun comes from the lightest element, hydrogen, fusing together to create the second lightest element, helium. Nuclear fusion on the Sun releases tremendous amounts of solar energy. The energy travels to the Earth, mostly as visible light. The light carries the energy through the empty space between the Sun and the Earth as radiation. Solar energy has been used for power on a small scale for hundreds of years, and plants have used it for billions of years. Unlike energy from fossil fuels, which almost always come from a central power plant or refinery, solar power can be harnessed locally (Figure 1.1). A set of solar panels on a homes rooftop can be used to heat water for a swimming pool or can provide electricity to the house. Societys use of solar power on a larger scale is just starting to increase. Scientists and engineers have very active, ongoing research into new ways to harness energy from the Sun more efficiently. Because of the tremendous amount of incoming sunlight, solar power is being developed in the United States in southeastern California, Nevada, and Arizona. Solar panels supply power to the Interna- tional Space Station. Solar power plants turn sunlight into electricity using a large group of mirrors to focus sunlight on one place, called a receiver (Figure 1.2). A liquid, such as oil or water, flows through this receiver and is heated to a high temperature by the focused sunlight. The heated liquid transfers its heat to a nearby object that is at a lower temperature through a process called conduction. The energy conducted by the heated liquid is used to make electricity. This solar power plant uses mirrors to focus sunlight on the tower in the center. The sunlight heats a liquid inside the tower to a very high temperature, producing energy to make electricity. Solar energy has many benefits. It is extremely abundant, widespread, and will never run out. But there are problems with the widespread use of solar power. Sunlight must be present. Solar power is not useful in locations that are often cloudy or dark. However, storage technology is being developed. The technology needed for solar power is still expensive. An increase in interested customers will provide incentive for companies to research and develop new technologies and to figure out how to mass-produce existing technologies (Figure 1.3). Solar panels require a lot of space. Fortunately, solar panels can be placed on any rooftop to supply at least some of the power required for a home or business. This experimental car is one example of the many uses that engineers have found for solar energy. Click image to the left or use the URL below. URL: Click image to the left or use the URL below. URL:

A: the source of solar power is nuclear
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Q: Terra-cotta Warriors As the greatest archaeological findings of the 20th century, Terra-cotta Warriors has a really long history.In 246 BC, Qin Shi Huang, later the first Emperor of all China, had begun to prepare for his mausoleum which took 11 years to finish to defend him in the afterlife.There are over 7,000 pottery soldiers, horses, bronze chariots, and even weapons found in it now.Terra-cotta Warriors was listed by UNESCO in 1987 as one of the world cultural heritages and it has made Xi'an a famous city for tourists. Big Wild Goose Pagoda The Big Wild Goose Pagoda has a history of over 1,300 years and is a typical ancient Chinese building.It is located in the south of Xi'an City.Because Master Xuanzang stored his classics brought from India in the pagoda, it is also a holy place for Buddhists.As a National Key Cultural Relic Preserve, it won the title of an AAAA Tourist Attraction as well. Xi'an Ancient City Wall As one of the landmarks of Xi'an, Ancient City Wall still stretches round the old city today, dividing the city into the inner part and the outer part.Ancient City Wall was originally built during the old Tang Dynasty (618 -- 907) and then enlarged by Zhu Yuanzhang, Emperor of the Ming Dynasty, thus forming the modern Xi'an City Wall.After the extension, the wall now stands 12 meters tall, 12-14 meters wide at the top and 15-18 meters thick at the bottom.

A:
Who are the text written for?
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